Which Users Should Be the Focus of Mobile Personal Health Records? Analysis of User Characteristics Influencing Usage of a Tethered Mobile Personal Health Record.

BACKGROUND: This study was conducted to analyze the usage pattern of a hospital-tethered mobile personal health records (m-PHRs) application named My Chart in My Hand (MCMH) and to identify user characteristics that influence m-PHR usage.
MATERIALS AND METHODS: Access logs to MCMH and its menus were collected for a total of 18 months, from August 2011 to January 2013. Usage patterns between users without a patient identification number (ID) and users with a patient ID were compared. Users with a patient ID were divided into light and heavy user groups by the median number of monthly access. Multiple linear regression models were used to assess MCMH usage pattern by characteristics of MCMH user with a patient ID.
RESULTS: The total number of MCMH logins was 105,603, and the median number of accesses was 15 times. Users (n = 7,096) mostly accessed the "My Chart" menu, but "OPD [outpatient department] Service Support" and "Health Management" menus were also frequently used. Patients with chronic diseases, experience of hospital visits including emergency room and OPD, and age group of 0-19 years were more frequently found among users with a patient ID (n = 2,186) (p < 0.001). A similar trend was found in the heavy user group (n = 1,123). Submenus of laboratory result, online appointment, and medication lists that were accessed mostly by users with a patient ID were associated with OPD visit and chronic diseases.
CONCLUSIONS: This study showed that focuses on patients with chronic disease and more hospital visits and empowerment functions in a tethered m-PHR would be helpful to pursue the extensive use.

Introduction

Electronic medical records (EMRs) can enhance communication, increase accessibility to medical information for patients, reduce medical errors, and improve patient safety. However, patient participation and access to EMRs are still limited because EMRs are primarily designed for healthcare providers, not for patients.[1-3] Personal health records (PHRs) can meet patients' needs of active participation and access to their own medical information.[4] By using PHRs, patients can more easily access and manage the medical information provided by hospitals.[3-6] Moreover, tools for the management of chronic diseases can be provided. In addition, if patients and medical institutions agree with integration of data, the medical information of several different medical institutions would be integrated.[7] Ideally, patients would control their own medical information by using PHRs, and thus PHRs are regarded as a paradigm shift and the core of patient-oriented health and medical services.[8-11]

Recently, mobile health has become more widespread due to the popularization of smartphones.[12,13] Mobile PHRs (m-PHRs) that use a smartphone or tablet device have also been developed to provide more accessibility and mobility for patients' health.[14] Smartphones can remove the barriers that prevent patients from using PHRs by increasing mobility, accessibility, and connectivity.[15,16]

PHRs should be user-friendly and provide services desired by patients.[9,17] To make m-PHRs more valuable tools for patient-centered care, further studies are needed to investigate m-PHR user experiences, usage patterns, and user characteristics. Many studies have examined the characteristics and disparities of PHR users, whereas only small numbers of studies have analyzed the characteristics of m-PHR users.[18]

Asan Medical Center (AMC), Seoul, Korea, the largest tertiary hospital in the country with about 2,700 registered inpatient beds and a large in-house hospital information system, developed a tethered m-PHR application (app) called My Chart in My Hand (MCMH) and released it on Google Play in January 2011.[19] The present study aimed to analyze the usage pattern of the MCMH app and to identify the user characteristics that affect m-PHR access.

Materials and Methods

Introduction to the MCMH App

The MCMH project was started in February 2010 to help patients view and manage their own health records themselves by using mobile devices. The MCMH app was developed by collaboration between the Ubiquitous Health Center at AMC, which was established to support mobile and e-health research and service, and a telecommunications company in Korea. The development process of the MCMH app is shown in . It took 11 months to design and build the app. When designing the app, we considered people from their 20s to their 50s, who could use a smartphone with relative ease and have more interest in their health information due to chronic disease, etc., as the target customer group. Key informant interviews were undertaken with participants who experienced treatment processes in the hospital, such as patients, doctors, and nurses. Based on the interview results, the MCMH app was mainly designed for chronic disease patients who could unrestrictedly use smartphones and functions that attract patients to access their health information. The monitoring system that shows a user's log data was developed in August 2011.

The development process of the My Chart in My Hand application. The My Chart in My Hand team was organized with doctors, a nurse, information technology technicians, a medical record administrator, and a mobile communication company (Co.) in February 2010. It took 11 months to design and develop My Chart in My Hand, which was released on Google Play in January 2011. IT, information technology; dz., disease; PHR, personal health record.

Screenshots of MCMH are shown in . The app largely contains five menus categorized by contents and purposes. The “My Chart” categorized menu shows patients' health information from the hospital, including laboratory results, problem lists, allergies, and medication history. Users can also manually enter medical information, including laboratory results, allergies, medication lists, and vital signs from other hospitals or clinics or self-measurements, but these data are managed separately from AMC data. This option was designed for patients to manage their medical information from various sources. The “Health Management” categorized menu provides diary tools for body weight, glucose, and blood pressure, as well as medical calculators such as those for body mass index, cardiovascular disease risk in 10 years, and metabolic syndrome risk. The “Medication Management” categorized menu includes medication schedulers and reminders of when to take medicines. The “OPD [outpatient department] Service Support” categorized menu offers appointments for the ambulatory care center and provides a patient-centered and convenient function that shows the patient's order in the waiting list of a doctor's office. The “Health Information” categorized menu gives various education materials on health information related to daily life. Because of healthcare environmental limitations and legal restrictions in Korea, MCMH did not include some options that are popular in other PHRs in the United States, such as prescription refilling and secure messaging between patients and physicians.[20-22]

Screenshots of the My Chart in My Hand application: (A) “Health Management,” (B) “My Chart,” (C) “Medication Management,” and (D) “Outpatient Department [OPD] Service Support” menus. AMC, Asan Medical Center; BMI, body mass index; BP, blood pressure; BST, blood sugar test; CVD, cardiovascular disease; HEM, Department of Hematology; Ht, height; OPD, outpatient department; Wt, weight.

Because MCMH is a tethered m-PHR app that communicates with the hospital database by patient identification number (ID) of AMC, the connected AMC database services like “My Chart” and “OPD Service Support” are provided exclusively for MCMH users with a patient ID. MCMH users without a patient ID technically can download MCMH but are limited in using the connected AMC database services.

Study Design and Procedure

Approval for this study was obtained from the Institutional Review Board of AMC.

The number of MCMH users who downloaded the app with or without a patient ID exceeded 7,000 in January 2013. To assess the usage pattern of MCMH, users (n = 4,910) without a patient ID and users (n = 2,186) with a patient ID who downloaded MCMH from August 2011 to January 2013 were selected.

To analyze the factors that affect the use of MCMH including the services that are connected with hospital database, only users with a patient ID were selected. The 2,186 users with a patient ID were grouped as either “light users” (n = 1,063) who accessed MCMH below the median of two times per a month or “heavy users” (n = 1,123) who logged in at or above the median of monthly access.

Users' information was collected from the hospital database and mobile server. From the hospital database, users' gender, age, residence, and health information including hospital visits (OPD, emergency room [ER], and hospitalization) and the presence of chronic diseases were gathered. From the mobile server, users' logged data for MCMH and categorized menus were assembled except for the “Health Information” menu, which was not included in the log monitoring system.

Distance from AMC to patient residence was grouped as “short distance” if the patient lived near AMC in the capital region and “long distance” if the patient lived in the non–capital region. We used the definitions of the Korea Center for Disease Control and Prevention, which includes cancer (C00–C97), diabetes (E10–E14), hypertensive disease (I20–I51), cerebrovascular disease (I60–I69), chronic lower respiratory disease (J40–J47), and liver disease (K70–K76).[23,24] All diseases are classified by the 10th International Classification of Diseases.

Users' characteristics and access logs were compared between the two groups (light and heavy users) to identify characteristics affecting MCMH usage.

Statistical Analysis

Descriptive statistics, correlations, and stepwise multiple linear regression analyses were computed with the SPSS version 23.0 statistical software package (IBM, Armonk, NY). Significance level was set at p < 0.05.

Results

Use Of MCMH

During the 1.5-year study period, the total number of MCMH logins was 105,603. shows the number of accesses to the menus of MCMH in detail. The most popular categorized menu in total user was the “My Chart” (total access = 314,062; mean access = 44.25 times). The most visited menu was “Laboratory Results” (total access = 275,703; mean access = 38.85 times), followed by the “Online Appointment,” “Medication Lists,” “Problem List,” and “Blood Sugar Test” menus.

Table 1.

Usage Pattern of My Chart in My Hand Mobile Personal Health Record

	MEAN					SUM
	USER WITH A PATIENT ID (N = 2,186)[a]					USER WITH A PATIENT ID (N = 2,186)[a]
CATEGORY	LIGHT USER (N = 1,063)[b]	HEAVY USER (N = 1,123)[c]	TOTAL LIGHT AND HEAVY USERS (N = 2,186)	USER WITHOUT A PATIENT ID (N = 4,910)[d]	TOTAL USERS (N = 7,096)	LIGHT USER (N = 1,063)[b]	HEAVY USER (N = 1,123)[c]	TOTAL LIGHT AND HEAVY USERS (N = 2,186)	USER WITHOUT A PATIENT ID (N = 4,910)[d]	TOTAL USERS (N = 7,096) (RANK)[e]
Login	9.54[f]	71.40	80.94	3.11[g]	14.88	10,136	80,178	90,314	15,289	105,603
“My Chart”	117.39[f]	166.13	283.52	0.55[g]	44.25	124,785	186,569	311,354	2,708	314,062
Laboratory results	108.64[f]	141.96	250.60	0.16[g]	38.85	115,483	159,418	274,901	802	275,703 (1)
Medication lists	6.21[f]	9.71	15.92	0.14[g]	2.56	6,606	10,902	17,508	680	18,188 (3)
Problem lists	6.33[f]	7.09	13.42	0.19[g]	2.20	6,734	7,958	14,692	919	15,611 (4)
Allergies	1.38[f]	2.48	3.86	0.06[g]	0.64	1,470	2,783	4,253	307	4,560
“OPD Service Support”	25.34	28.80	54.14	0.05[g]	8.38	26,937	32,344	59,281	218	59,499
Online appointment	26.89[f]	21.65	48.54	0.04[g]	7.48	28,583	24,310	52,893	191	53,084 (2)
Waiting list check	2.38[f]	3.44	5.82	0.01[g]	0.90	2,526	3,862	6,388	27	6,415
“Health Management”	10.97	11.97	22.94	1.86[g]	4.82	7,821	17,281	25,102	9,151	34,253
Blood sugar test	4.05	3.97	8.02	1.11[g]	2.00	4,307	4,454	8,761	5,462	14,223 (5)
Blood pressure	0.54[f]	4.91	5.45	0.45[g]	1.17	576	5,518	6,094	2,216	8,310
Body mass index	1.47[f]	3.69	5.16	0.15[g]	0.91	1,563	4,148	5,711	743	6,454
Health calculator
10 CVD risk	0.71[f]	1.49	2.20	0.08[g]	0.40	755	1,671	2,426	410	2,836
Metabolic syndrome	0.58[f]	1.33	1.91	0.07[g]	0.34	620	1,490	2,110	320	2,430
“Medication Management”	6.52	6.51	6.51	6.52	2.23	6,929	7,315	14,244	1,653	15,897
Today's medication schedule	2.17[f]	3.62	5.79	0.12[g]	0.98	2,303	4,068	6,371	574	6,945
Medication schedules	1.29[f]	1.84	3.13	0.08[g]	0.54	1,375	2,065	3,440	413	3,853
Medication alarm setting	0.62[f]	1.79	2.41	0.06[g]	0.41	655	2,009	2,664	271	2,935
Insulin injection schedule	0.29[f]	1.30	1.59	0.08[g]	0.30	309	1,460	1,769	395	2,164

A user with a patient identification number (ID) who is able to fully access My Chart in My Hand.

A light user is someone who accessed My Chart in My Hand at or below the median (less than two times per a month) of the users with a patient ID.

A heavy user is someone who accessed My Chart in My Hand above the median (two or more times per a month) of the users with a patient ID.

A user without a patient ID who is able to fully access My Chart in My Hand except for “My Chart” and “Outpatient department [OPD] Service Support” categorized menus that communicate with the hospital database.

Ranked in order of popularity except for categorized menus such as the “My Chart” menus.

The p values (< 0.05) indicate significant difference in number of logins or accesses to each menu between the light user and heavy user with a patient ID by t test.

The p values (< 0.05) indicate significant difference in number of logins or accesses to each menu between the user without a patient ID and the user with a patient ID by t test.

CVD, cardiovascular disease.

Compared with the users without a patient ID, the users with a patient ID accessed all of menus much more frequently. The most popular menu among the users with a patient ID was communication with the hospital database based on the patient ID, such as “Laboratory Results” (mean access = 250.60 times versus mean access = 0.16 times), “Online Appointment” (mean access = 48.54 times versus mean access = 0.04 times), and “Medication Lists” (mean access = 15.92 times versus mean access = 0.14 times).

In comparison with light users among users with a patient ID, heavy users logged into the MCMH app more frequently (mean access = 71.40 times versus mean access = 9.54 times). Heavy users accessed most of the menus except for “Blood Sugar Test” (mean access = 3.97 times versus mean access = 4.05 times) and “Online Appointment” (mean access = 21.65 times versus mean access = 26.89 times) more often.

Demographic Profile of the Users with a Patient ID

General characteristics including gender, age, distance to the hospital from the residence, and health-related attributes like hospital visit frequency and presence of chronic diseases were gathered for all study subjects (n = 2,186) who had a patient ID (). There were significant differences in general characteristics and health-related attributes between the heavy and light user groups (p < 0.05).

Table 2.

Demographic Profiles of the My Chart in My Hand Users with a Patient Identification Number

	N (% OF ROW)
VARIABLE, CATEGORY	LIGHT USER (N = 1,063)[a]	HEAVY USER (N = 1,123)[b]	TOTAL (N = 2,186)	P VALUE
Gender				0.022[c]
Male	536 (50.4)	621 (55.3)	1,157 (52.9)
Female	527 (49.6)	502 (44.7)	1,029 (47.1)
Age (years)				<0.001[c]
0–19	80 (7.5)	218 (19.4)	298 (13.7)
20–39	563 (53.0)	439 (39.1)	1,002 (45.8)
40–59	327 (30.8)	369 (32.9)	696 (31.8)
≥60	93 (8.7)	97 (8.6)	190. (8.7)
Mean ± SD	37.60 ± .15.18	35.76 ± 17.65	36.6 ± 16.5
Long distance to the hospital				<0.001[c]
Yes	317 (29.8)	431 (38.4)	748 (34.2)
No	746 (70.2)	692 (61.6)	1,438 (65.8)
Chronic disease patient				<0.001[c]
Yes	373 (35.1)	963 (85.8)	1,336 (61.1)
No	690 (64.9)	160 (14.2)	850 (38.9)
Experience of hospitalization				<0.001[c]
Yes	695 (65.4)	563 (50.1)	1,258 (57.5)
No	368 (34.6)	560 (49.9)	928 (42.5)
Number of hospital visits (mean ± SD)
ER	0.55 ± .1.71	1.57 ± 2.92	1.07 ± 2.46	<0.001[d]
OPD	10.46 ± 11.48	20.22 ± 15.65	15.48 ± 14.62	<0.001[d]

Data are number of subjects (%).

A light user is someone who accessed My Chart in My Hand at or below the median (less than two times per month) of the users with a patient ID.

A heavy user is someone who accessed My Chart in My Hand above the median (two or more times per month) of the users with a patient ID.

By chi-squared test.

By t test.

ER, emergency room; OPD, outpatient department; SD, standard deviation.

Heavy users had a higher proportion of males than light users (55.3% versus 50.4%; p = 0.022). The distribution of age groups differed between total heavy users and light users (p < 0.001). The users in the age group of 0–19 years made up a relatively larger portion of the heavy group than of the light user group (19.4% versus 7.5%). The heavy user group had a smaller portion of the age group of 20–39 years than the light user group (39.1% versus 53.0%). There were more patients whose residence was in a long distance from the hospital in the heavy user group than in the light user group (38.4% versus 29.8%; p < 0.001), however, more than half of users in each group lived in a short distance from the hospital. Chronic disease patients were more likely to be heavy users (85.8% versus 35.1%; p < 0.001). Heavy users also differed from light users in experiences of hospitalization (50.1% versus 65.4%; p < 0.001). Heavy users had more hospital visits (p < 0.001).

Characteristics of Users with a Patient ID Influencing MCMH Usage

To analyze the interconnections between MCMH usage and characteristics of users with patient ID, we performed correlation analyses (). Most of the user's characteristics, including gender, distance to the hospital, hospital visit frequency, presence of chronic diseases, and age group except for the 40–59-year-old age group, were significantly interconnected with MCMH access (p < 0.05). The variables of chronic disease patient, ER visit, and OPD visit were positively associated with MCMH accesses.

Table 3.

Correlation Analyses to Find Out the Interconnection Between My Chart in My Hand Access and the User's Characteristics with a Patient Identification Number

	MCMH ACCESS (LOGIN)	GENDER	0–19 YEARS OLD	20–39 YEARS OLD	40–59 YEARS OLD	OVER 60 YEARS	DISTANCE TO THE HOSPITAL	CHRONIC DISEASE PATIENT	HOSPITALIZATION	ER VISITS	OPD VISITS
MCMH access (login)	1.000
Gender	−0.055[a]	1.000
0–19 years	0.296[b]	−0.033	1.000
20–39 years	−0.172[b]	0.218[b]	−0.365[b]	1.000
40–59 years	−0.008	−0.174[b]	−0.272[b]	−0.629[b]	1.000
Over 60 years	−0.044[b]	−0.057[a]	−0.123[b]	−0.284[b]	−0.211[b]	1.000
Distance to the hospital	0.085[b]	−0.010	0.079[b]	−0.044[a]	−0.048[a]	0.062[a]	1.000
Chronic disease patient	0.409[b]	−0.118[b]	0.035	−0.202[b]	0.122[b]	0.113[b]	0.116[b]	1.000
Hospitalization	−0.242[b]	0.026	−0.026	0.053[a]	−0.023	−0.024	−0.017	−0.102[b]	1.000
ER visits	0.351[b]	−0.001	0.273[b]	−0.112[b]	−0.073[b]	−0.014	−0.001	0.186[b]	−0.094[b]	1.000
OPD visits	0.460[b]	0.073[a]	0.204[b]	−0.138[b]	−0.016	0.023	−0.043[a]	0.332[b]	−0.125[b]	0.310[b]	1.000

p < 0.05, bp < 0.001.

ER, emergency room; MCMH, My Chart in My Hand; OPD, outpatient department.

We conducted stepwise multiple linear regression analyses to identify significant predictors of MCMH users with a patient ID including the variables that appeared to correlate with MCMH access (i.e., gender, distance to the hospital, hospital visit frequency, presence of chronic diseases, and age groups except for the 40–59-year-old age group) (). The variable of 20–39-year-old age group was excluded from the regression analyses by the stepwise method. MCMH usage of users with a patient ID was predicted best by OPD visit, with further positive influences of chronic disease patient, 0–19-year-old age group, ER visit, and long distance to the hospital and negative influences of hospitalized experience, age group over 60 years old, and female gender (p < 0.001). These variables explain 38.8% of variance.

Table 4.

Multiple Regression Analysis to Identify Significant Characteristics of the My Chart in My Hand (MCMH) Users with a Patient Identification Number That Are Associated with MCMH Access

MODEL[a]	B	β	T	P
(Constant)	1.652		27.674	<0.001
OPD visit[b]	0.014	0.276	14.591	<0.001
Chronic disease patient[c]	0.413	0.263	14.307	<0.001
0–19 years old[d]	0.380	0.170	9.529	<0.001
Experience of hospitalization[e]	−0.249	−0.161	−9.494	<0.001
ER visit[f]	0.048	0.155	8.482	<0.001
Over 60 years old[g]	−0.181	−0.067	−3.906	<0.001
Long distance to the hospital[h]	0.088	0.054	3.185	0.001
Female gender[i]	−0.058	−0.038	−2.208	0.027

R = 0.623; R2 = 0.388; adjusted R2 = 0.386; p < 0.001. The variable 20–39 years was excluded by stepwise regression analyses.

Each additional increment in outpatient department (OPD) visits was associated with a 0.014 times per month increase in MCMH access (p < 0.001).

A chronic disease patient's access to MCMH was 0.413 times/month higher than that of a non–chronic disease patient (p < 0.001).

MCMH access of the 0–19-year-old age group was 0.380 times higher than those of other age groups (p < 0.001).

A patient with experience of hospitalization was associated with a 0.249 times decrease in MCMH access (p < 0.001).

Each additional emergency room (ER) visit was associated with a 0.048 times increase in MCMH access (p < 0.001).

MCMH access of the age group over 60 years of age was 0.181 times lower than those of other age groups (p < 0.001).

A long distance to the hospital was associated with a 0.088 times increase in MCMH access (p = 0.001).

MCMH access of females was 0.058 times lower than that of males (p = 0.027).

To analyze significant predictors of heavy user characteristics, we performed stepwise multiple linear regression analyses including the variables that appeared to interconnect with MCMH access (). The variables of long distance to the hospital, gender, age group of 20–39 years old, and age group over 60 years old were excluded from the regression analyses by the stepwise method. MCMH usage of heavy users was also predicted best by OPD visit, and other influencing factors were similar in slightly different order from the predictors of MCMH users with a patient ID. These variables explain 29.9% of variance.

Table 5.

Multiple Regression Analysis to Identify Significant Characteristics of the Heavy My Chart in My Hand (MCMH) Users with a Patient Identification Number That Are Associated with MCMH Access

MODEL[a]	B	β	T	P
(Constant)	2.100		34.234	<0.001
OPD visit[b]	0.014	0.290	10.986	<0.001
0–19 years[c]	0.405	0.207	7.740	<0.001
ER visit[d]	0.054	0.205	7.617	<0.001
Experience of hospitalization[e]	−0.235	−0.152	−5.999	<0.001
Chronic disease patient[f]	0.131	0.059	2.326	0.020

R = 0.547; R2 = 0.299; adjusted R2 = 0.296; p < 0.001. The variables 20–39 years, over 60 years, long distance to the hospital, and gender were excluded by stepwise regression analyses.

Each additional increment in outpatient department (OPD) visits was associated with a 0.014 times increase in MCMH access (p < 0.001).

MCMH access of the 0–19-year-old age group was 0.405 times higher than those of other age groups (p < 0.001).

Each additional emergency room (ER) visit was associated with a 0.054 times increase in MCMH access (p < 0.001).

A patient with experience of hospitalization was associated with a 0.235 times decrease in MCMH access (p < 0.001).

A chronic disease patient's access to MCMH was 0.131 times higher than that of a non–chronic disease patient (p = 0.020).

We conducted stepwise multiple linear regression analyses to identify significant characteristics of MCMH users with a patient ID on popular submenus including “Laboratory Results,” “Online Appointment,” and “Medication Lists” (). The access of “Laboratory Results” was explained with weak power (R2 = 0.038) by chronic disease patient and further by more OPD visits, by less 60-year-old age group, and by more ER visits. The access of “Online Appointment” was explained with weak power (R2 = 0.023) best by fewer ER visits and more OPD visits, with further negative influences of hospitalization and age group of 0–19 years old and positive influences of chronic disease patient. The access of “Medication Lists” was explained by chronic disease patient, more OPD visits, and no hospitalization (R2 = 0.083).

Table 6.

Multiple Regression Analysis to Identify Significant Characteristics of My Chart in My Hand Users with a Patient Identification Number That Are Associated with Access to Popular Submenus

	LABORATORY RESULTS[a]		ONLINE APPOINTMENT[b]		MEDICATION LISTS[c]
	B (β)	P (T)	B (β)	P (T)	B (β)	P (T)
(Constant)	0.829	<0.001 (63.741)	1.189	<0.001 (50.628)	0.476	<0.001 (20.033)
OPD visit	0.002 (0.066)	0.004 (2.866)	0.003 (0.083)	<0.001 (3.500)	0.005 (0.144)	<0.001 (6.619)
Chronic disease patient	0.103 (0.143)	<0.001 (6.341)	0.053 (0.051)	0.023 (2.275)	0.192 (0.179)	<0.001 (8.212)
0–19 years			−0.082 (–0.057)	0.011 (–2.551)
Experience of hospitalization			−0.064 (–0.064)	0.003 (–2.983)	−0.090 (–0.085)	<0.001 (–4.110)
ER visit	0.006 (0.044)	0.049 (1.973)	−0.018 (–0.089)	< 0.001 (–3.871)
Over 60 years	−0.056 (−0.045)	0.034 (–2.119)
Long distance to the hospital
Female gender

R = 0.194; R2 = 0.038; adjusted R2 = 0.036; p < 0.001. The variables 20–39 years, 0–19 years, experience of hospitalization, long distance to the hospital, and gender were excluded by stepwise regression analyses.

R = 0.150; R2 = 0.023; adjusted R2 = 0.020; p < 0.001. The variables 20–39 years, over 60 years, long distance to the hospital, and gender were excluded by stepwise regression analyses.

R = 0.289; R2 = 0.083; adjusted R2 = 0.082; p < 0.001. The variables 20–39 years, 0–19 years', emergency room (ER) visit, over 60 years, long distance to the hospital, and gender were excluded by stepwise regression analyses.

OPD, outpatient department.

Discussion

m-PHR could be the hub of m-health because it contains patient health information, is in the hands of the patients themselves, and can be directly connected to peripheral devices such as activity trackers and blood sugar test devices.[25,26] It is expected that the efficiency and effectiveness of m-PHRs will be increased by the use of sensors, cameras, recording functions, or barcode reader applications in smartphones.[27] For patient empowerment and safety, integrated m-PHRs that interact with EMRs are the best choice.[2] However, when integrated m-PHRs are not available, a tethered m-PHR that shares some medical information through EMRs can be the next, most suitable choice.[2]

In MyChart, the Web-based PHR of the Cleveland Clinic, about 75% (450,000 users) of the members have used their PHR at least once.[28] In the case of Kaiser Permanente, the three most visited features of their My Health Manager PHR from 2004 to 2007 were the laboratory test review, prescription refills, and e-mail messages to providers.[14,25,28-30] In the stand-alone PHR that depends solely on patient-entered data as the trusted medical record,[2] “Laboratory Results” was the least frequently used information menu, and “Medication Information” was the most visited menu.[31-33] In our current study, like the My Health Manager, the laboratory results option was the most viewed menu that and was accessed a total of 275,703 times during the study period (about 15,317 times/month) (). It is interesting that the OPD online appointment function, which is also available at the AMC homepage, was ranked second to laboratory results, followed by medication lists and problem lists. Not only menus linked to the hospital information system that are characteristics of a tethered PHR but also menus that are characteristics of a stand-alone PHR were well used by some patients, including the “Health Management” categorized menu for blood sugar test (about 790 times/month), blood pressure (about 462 times/month), and body mass index (about 359 times/month) and “Medication Management” categorized menu for medication schedules (about 214 times/month).

Increased access to MCMH was significantly associated with an increased use of the “OPD Service Support,” “Health Management,” and “My Chart” categorized menus. Although the “OPD Service Support” categorized menu was not the most visited menu, the users of this service were more active MCMH users. Users who made more visits to the hospital or had a chronic disease accessed MCMH more often. These results were in agreement with those of other studies that showed a strong correlation between the degree of sickness, including numbers of diagnoses and clinical visits, and frequency of PHR use.[28,34,35]

Regarding the age of PHR users, previous studies provided contradictory findings, such as disparities in specific age groups or similarities among all ages.[28,36,37] More than 80% of MCMH users with a patient ID were between 20 and 59 years old. However, the users in the 0–19-year-old age group showed a higher percentage of heavy users. This may be explained by the observation that about 53.2% (116 persons) of the 0–19-year-old age group in heavy users have a chronic disease, including malignant neoplasm and leukemia. This result may be because their parents accessed MCMH on the behalf of younger patients, especially children, even though such access was technically not allowed. Regardless of the cause of the prevalent use of MCMH in younger patients, it may be important to focus on young people to promote the use of MCMH and similar PHR apps.

Lesson Learned

We could learn several lessons from analysis of the usage pattern and user characteristics. First, users want not only to see their medical information that is provided by the hospital, but also to engage with their health management. Second, users are interested in the hospital-supporting functions like “Online Appointment.” Even though it is difficult to predict, other useful hospital-supporting functions, if provided, may also be popular functions of an m-PHR. Third, the m-PHR must be focused or upgraded for active users who access and use the m-PHR more frequently. Chronic disease patients who visited the hospital frequently showed increased access to the m-PHR. Thus, specific functions or menus for chronic disease patients, such as cancer marker results, health tools for other chronic diseases, and daily care plans for inpatients, should be developed and provided. Specific PHRs for cancer, asthma, hospitalized, and pediatric patients will also be useful. Finally, functions that use exact user information and location can be useful in m-PHRs. For example, the “Waiting List Check” function in this study used patient OPD appointment data, their arrival information to the OPD, and the OPD schedule information system.

Limitations and Future Studies

This study has some limitations that also represent opportunities for future work. We only examined logged data, not actual behavior. Although a robust body of evidence demonstrates that intentions predict behavior,[38] thereby mitigating this concern, there may still be unplanned accesses due to an unstable Internet connection, unintended menu selection, or other events. We did not analyze other possible factors affecting use of the m-PHR, include socioeconomic status, the required time to visit AMC, encouragement by attending doctors and family, technology anxiety, ease of use, and health literacy.[28,39,40] Because such data cannot be retrieved from a hospital information system, new research design is needed, including a patient survey. In addition, further research will be necessary to analyze for focused use of MCMH-specific functions such as “Waiting List Check,” a unique patient-centered menu, even though the access was not very popular, and for the divide between hospitalized patients and OPD and ER patients of “My Chart” to engage the patients in their plan of care.

Conclusions

This study may indicate ways for healthcare providers and technology companies to develop helpful tethered m-PHR apps for patients. It showed the usage characteristics that focus on chronic disease patients that enabled active use of the tethered m-PHR app and also showed which empowerment and engagement function in the app would be helpful to pursue the extensive use.