Correction: Risk factors associated with prolonged hospital length-of-stay: 18-year retrospective study of hospitalizations in a tertiary healthcare center in Mexico.

[This corrects the article DOI: 10.1371/journal.pone.0207203.].

In Table 1, the variable that reads "2 patients per medical team (March 2008-December 2017)" is incorrect. The variable should read "12 patients per medical team (March 2008-December 2017)". The publisher apologizes for the error.

Table 1

Comparison of characteristics of hospitalizations by type of episode (normal vs prolonged length-of-stay) from 2000–2017.

Characteristic	Normal length-of-stay (NLOS)(N = 81,477, 95%)	Prolonged length-of-stay (PLOS)(N = 4,427, 5%)	p
Length-of-stay in daysa	8 (5–13)	45 (38–60)	<0.001
Age at hospitalization	52 (35–66)	48 (32–62)	<0.001
Female (%)	45,431 (55.76)	2,340 (52.9)	<0.001
Residence (%)
• Mexico City    • Outside Mexico City    • Unknown	32,973 (40.5)30,227 (37.1)18,277 (22.4)	1,481 (33.5)1,825 (41.2)1,121 (25.3)	<0.001
Type of admission (%)
• Urgent    • Elective	8,939 (11.0)72,538 (89.0)	1,277 (28.8)3,150 (71.2)	<0.001
Surgical patients (%)	33,143 (40.7)	2,767 (62.5)	<0.001
Shared Room (%)	58,584 (71.9)	3,458 (78.1)	<0.001
Patient to physician ratio (%)
• 20 patients per medical team (January 2000-February 2008)	35,785 (43.9)	1,869 (42.2)	0.026
• 12 patients per medical team (March 2008-December 2017)	45,692 (56.1)	2,558 (57.8)
Day of admission (%)
• Weekday (Monday-Thursday)    • Weekend (Friday-Sunday)	56,329 (69.1)25,148 (30.9)	2,842 (64.1)1,591 (35.9)	<0.001
Hospital readmissions (%)	35,656 (43.8)	1,799 (40.6)	<0.001
Distribution by type of readmission (%)
• ≤ 30 days• >30 days	9,937 (27.9)25,719 (72.1)	605 (33.6)1,194 (66.4)	<0.001
Time for readmission
• ≤ 30 days    • >30 days	13 (7–21)261 (93–793)	11 (6–18)201 (81–713)	<0.001
Surgeries per patientb	1 (1)	2 (1–3)	<0.001
Additional diagnoses	3 (2–5)	5 (3–8)	<0.001
Socioeconomic level	3 (2–4)	2 (2–3)	<0.001
Socioeconomic statusc (%)
• Low (1–2)    • Mid (3–4)    • High (5–7)	32,056 (39.3)38,341 (47.1)11,080 (13.6)	2,358 (53.3)1,622 (36.6)447 (10.1)	<0.001
In-hospital Mortality (%)	3,035 (3.7)	588 (13.3)	<0.001
Location of death (%)
• Hospital ward    • Emergency Department    • Intensive care unit	1,887 (62.2)574 (18.9)574 (18.9)	272 (46.3)110 (18.7)206 (35.0)	<0.001

a Continuous variables are summarized using medians and interquartile ranges (IQR)

b Only surgical patients were included in this analysis (N = 35,910)

c Socioeconomic status is a construct used by the MNIH that comprises the following elements: monthly household income, family`s main provider`s occupation, monthly household expenses, type of housing and family`s health status. Patients are classified in seven levels (1–7) and that determines the amount the patient should pay for healthcare.