Illness cognitions and family adjustment: psychometric properties of the Illness Cognition Questionnaire for parents of a child with cancer.

PURPOSE: Illness cognitions are an important mediator between disease and psychological adjustment. This study assessed the psychometric properties of the Illness Cognition Questionnaire (ICQ), adjusted for the parents of an ill child.
METHODS: Participants were recruited from two multicenter studies: sample 1 included 128 parents of a child diagnosed with acute lymphoblastic leukemia (ALL) (response rate 82 %) and sample 2 included 114 parents of a child diagnosed with cancer (response rate 74 %). Parents completed an adapted version of the ICQ (Illness Cognition Questionnaire-Parent version (ICQ-P)), together with the Profile of Mood States (POMS; sample 1) or the Hospital Anxiety and Depression Scale (HADS; sample 2). The factor structure of the ICQ-P was examined by means of principal component analysis. Cronbach's alpha for each subscale and correlations between the ICQ-P scales and the HADS and POMS were calculated. The illness cognitions of parents with and without psychological distress were compared.
RESULTS: Factor analysis confirmed the hypothesized structure of the ICQ-P in our sample (n = 242). The three scales Helplessness, Acceptance, and Perceived Benefits explained 9.8, 31.4, and 17.9 % of the variance, respectively. Cronbach's alpha showed adequate internal consistency (.80-.88). Concurrent and criterion-related validity were appropriate.
CONCLUSIONS: The results confirm that the ICQ-P reliably assesses the illness cognitions of the parents of a child with cancer. Psychologically distressed parents showed less acceptance and more helplessness. The availability of a short and valid illness cognition questionnaire will help clinicians gain insight into parental cognitions regarding the illness of their child, information that might be helpful for targeting interventions.

Introduction

Patients diagnosed with a chronic illness have their own beliefs about their illness, defined as illness cognitions. Illness cognitions can be described as a patient’s perception, interpretation, and understanding of the disease and its treatment [1-3]. Illness cognitions refer to the common-sense model of illness representations from Leventhal [1]. The theory describes beliefs and expectations people have regarding a disease or medical complaints. A patient’s beliefs influence their ability to cope with and adjust to illness [4], and illness cognitions may be a significant mediator between the condition and the patient’s well-being [5-9]. For example, patients who perceive their illness as having serious consequences and as being chronic, experience more physical, emotional, and social problems than do patients who perceive their illness as being curable and controllable [6-8].

Similar findings have been obtained regarding the illness cognitions of the parents of an ill child, particularly a child with cancer. Parental cognitions about how stressful the illness is to the child, how life-threatening the cancer is, the intensity of treatment, and their own ability to cope with their child’s disease are significantly associated with parental distress [10-13]. Parents who are optimistic and who see benefits are less distressed than parents who do not have this optimistic frame of mind [14-16]. In turn, parental distress influences the child’s distress [17-21], and therefore illness beliefs affect the psychological adjustment of the entire family. Insight into parental cognitions regarding their child’s disease may help therapists to understand maladaptive adjustment. While there are some questionnaires to assess parental illness cognitions [12, 22], they mainly focus on negative illness cognitions. We used the Illness Cognition Questionnaire (ICQ) in this study because it has been shown to predict adjustment problems in adults with chronic conditions [5, 23] and includes both positive and negative cognitions related to disease, namely, helplessness, acceptance, and perceived benefits.

The objectives of this study were to adapt the ICQ, which was originally developed for adults with a chronic condition [5], for use in parents of an ill child (Illness Cognition Questionnaire-Parent version (ICQ-P)), to assess its psychometric properties, and to determine whether scores are associated with parental distress. We also investigated whether the original three-factor structure (Helplessness, Acceptance, and Perceived Benefits) found in adult patients is equally valid for the parents of children with cancer. We expected that the ICQ-P would have an adequate factor structure and appropriate reliability and validity in our sample. Furthermore, we expected adaptive illness cognitions (Acceptance) to be negatively associated with parental psychological distress and hypothesized that maladaptive illness cognitions (Helplessness) would be associated with parental psychological distress.

Methods

Sample

Data on the illness cognitions of the parents of a child with cancer were collected in two studies: sample 1 consisted of parents who participated in the period 2006–2009 and sample 2 consisted of parents who participated in the period 2012–2013. The two studies were similar in terms of including the parents of a child diagnosed with cancer and the time since diagnosis (around 1 month, see Table 1). Families in sample 1 completed paper-and-pencil questionnaires, whereas families in sample 2 filled in Web-based questionnaires.

Table 1

Demographic information of participating families

	Study 1 N = 128	Study 2 N = 114	Total N = 242
Age parent
M (SD)	38.20 (5.99)	39.86 (6.55)	38.98 (6.30)
Range	25–55	24–55	24–55
Gender parent
Mother	111 (87 %)	74 (65 %)	185 (76 %)
Father	17 (13 %)	40 (35 %)	57 (24 %)
Education parent
Low	16 (13 %)	9 (8 %)	25 (10 %)
Medium	62 (48 %)	37 (32 %)	99 (41 %)
High	50 (39 %)	68 (60 %)	118 (49 %)
Marital status parent
Single	15 (12 %)	3 (3 %)	18 (7 %)
Age child
M (SD)	6.52 (4.26)	7.87 (5.10)	7.15 (4.71)
Range	1–17	0–17	0–17
Gender child
Boy	68 (53 %)	65 (57 %)	133 (55 %)
Girl	60 (47 %)	49 (43 %)	109 (45 %)
Diagnosis
Hematological
Leukemia	128 (100 %)	29 (25.4 %)	157 (64.9 %)
Hodgkin’s lymphoma		8 (7.0 %)	8 (3.3 %)
Non-Hodgkin lymphoma		13 (11.4 %)	13 (5.4 %)
Neuro-oncological
Brain/CNS tumor		19 (16.7 %)	19 (7.9 %)
Solid
Ewing’s sarcoma		6 (5.3 %)	6 (2.5 %)
Neuroblastoma		7 (6.1 %)	7 (2.9 %)
Rhabdomyosarcoma		6 (5.3 %)	6 (2.5 %)
Wilms’ tumor		8 (7.0 %)	8 (3.3 %)
Osteosarcoma		11 (9.6 %)	11 (4.5 %)
Other solid tumor		7 (6.2 %)	7 (2.9 %)
Mean time after diagnosis
M (SD)	41 days (22.84)	30 days (14.61)	36 days (20.08)
Range	5–131 days	4–80 days	4–131 days

The first sample comprised the parents of children with acute lymphoblastic leukemia (ALL) recruited from six of the seven Dutch pediatric oncology centers (response rate 82 %) [24]. Reasons for non-response were too overwhelmed or medical complications. This study focused on the adjustment of children with ALL during treatment and predictors of child adjustment. Inclusion criteria were age 1.5–18 years, recent diagnosis of ALL, treatment according to the Dutch Childhood Oncology Group (DCOG) ALL 10 protocol [25], and parental fluency in Dutch. The study was approved by the medical ethics review boards of the participating institutions.

The second sample comprised the parents of children recently diagnosed with cancer from four of seven Dutch pediatric oncology centers (response rate 74 %). Reasons for non-response were too overwhelmed, not interested, or medical complications. This study focused on the validation of the Psychosocial Assessment Tool (PAT) and investigated the effects of psychosocial screening in pediatric oncology. Inclusion criteria were age 0–17 years, recent diagnosis of cancer, and parental fluency in Dutch; children with a life expectancy <6 months or a relapse were excluded. The study was approved by the medical ethics review boards of the participating institutions.

The samples were compared regarding child age and gender, and time since diagnosis. The patients in sample 1 were younger (T = −2.25, p = .03), and their parents completed the questionnaires longer after diagnosis (T = 4.30, p = .00) than the patients/parents in sample 2. Patient gender was not significantly different (χ = .78, p = .38).

Measures

Sociodemographic information (diagnosis, family structure, socioeconomic status) was collected with a self-developed questionnaire.

Parental illness cognitions about the disease of their child were assessed with the ICQ-P (adapted from the ICQ with permission from the developers) [26]. See “Appendix” for the questionnaire. The ICQ measures illness cognitions that reflect different ways of evaluating the aversive character of a chronic condition of a patient, namely, helplessness (e.g., “My illness controls my life”), acceptance (e.g., “I can handle the problems related to my illness”), and disease benefits (e.g., “Dealing with my illness has made me a stronger person”). Items are scored on a 4-point Likert scale (1 = not at all, 2 = somewhat, 3 = to a large extent, 4 = completely), and each subscale consists of 6 items. Scale scores are calculated by summing the item scores, resulting in a subscale score ranging from 6 to 24 and a total score ranging from 18 to 72. The text of the questions was adapted to make it appropriate for the parents of ill children. For example, “my illness” in the original questionnaire was changed to “my child’s illness”. The internal consistency of the three scales of the original ICQ ranged from α = .84 to α = .91 [5].

Parental psychological distress (sample 1) was assessed with the Dutch shortened version of the Profile of Mood States (POMS) [27, 28]. The POMS is a self-report questionnaire investigating changeable mood states and consists of 32 items. It is designed to measure mood in five different domains: fatigue (6 items), irritation (7 items), vigor (5 items), tension (6 items), and depression (8 items). The answers are scored on a 5-point scale ranging from “not at all” (0) to “extremely” (4). The reliability and validity of this scale are good (α = .76–α = .95) [27]. In the current study, internal consistency for the different domains ranged from α = .79 to α = .91.

Parental psychological distress (sample 2) was assessed with the Hospital Anxiety and Depression Scale (HADS) [29, 30]. The HADS is a self-report questionnaire assessing the presence of anxious and depressive states in a medical setting. It consists of 14 items in two domains: anxiety (7 items) and depression (7 items). Answers are scored on a 4-point scale, ranging from 0 to 3. The total score is an indication of overall distress (range 0–42). In this study, a cutoff score of ≥13 for the total scale was used to distinguish clinically distressed parents from normally functioning parents [31]. The reliability and validity of this scale are good (α = .71–α = .90) [30]. In the current study, internal consistency for the different scales ranged from α = .82 to α = .91.

Statistical methods

First, the factor structure of the ICQ-P was examined using principal component analysis (PCA) with oblique rotation with a fixed number of three factors, using Statistical Package for Social Sciences (SPSS) version 20. Analyses were first performed separately for the two samples, but results are reported for the combined sample because of the high levels of agreement. Kaiser-Meyer-Olkin Measure of Sampling Adequacy (KMO) and Bartlett’s Test of Sphericity were checked before interpreting the rotated factor loadings. Kaiser recommends a minimum KMO of 0.5 [32]. Each item was assumed to load on one factor only. Factor loadings of 0.36 or higher were considered significant, based on a sample size of 200 [33]. To examine the psychometric properties of the ICQ-P, Cronbach’s alpha was calculated for each subscale; a value of 0.60 or higher was considered acceptable [34]. Pearson correlations were calculated between the three subscales to investigate their mutual relationship. A one-way ANOVA was used to compare scores on the ICQ-P between mothers and fathers and between the different diagnoses (hematological = leukemia and lymphoma; solid = Ewing’s sarcoma, neuroblastoma, rhabdomyosarcoma, Wilms’ tumor, osteosarcoma, and other solid tumors; neuro-oncological = brain/CNS tumor). To test the concurrent validity of the ICQ-P, Pearson correlations between ICQ-P scores and POMS (sample 1) and HADS (sample 2) scores were calculated. To test criterion-related validity, the ICQ-P scores of distressed parents (HADS total score ≥13) and non-distressed parents (HADS total score ≤12) were compared, using a one-way ANOVA. This analysis was performed only with the HADS, which has a validated cutoff point, unlike the POMS. Cohen’s d was calculated as a measure of effect size. P values ≤0.05 were considered statistically significant. Effect sizes .20 were considered small, .50 medium, and .80 large [35].

Results

Sample characteristics

In total, there were 242 participants (Table 1). The patients were aged 0–17 years (M = 7.15, SD = 4.71), 133 boys (55.0 %) and 109 girls (45.0 %). The mean time from diagnosis to completion of the questionnaires was 36 days. Overall, 73.6 % children were diagnosed with a hematological tumor, 7.9 % with a neuro-oncological tumor, and 18.6 % with a solid tumor. Questionnaires were completed by either mothers or fathers: 185 (76.4 %) mothers and 57 (23.6 %) fathers, aged 24–55 years (M = 38.98, SD = 6.30).

Factor analysis and reliability of the ICQ-P

The suitability of data for factor analysis was established with the Kaiser-Meyer-Olkin test (.87) and Bartlett’s Test of Sphericity. The different items loaded on the three original factors (Helplessness, Acceptance, and Perceived Benefits) (Table 2). The three original subscales, each consisting of 6 items, explained 9.8, 31.4, and 17.9 % variance, respectively. Together, this three-component solution explained 59.1 % of the total variance. Cronbach’s alpha (.80–.88) showed that the scales had an adequate internal consistency. The mean scores of mothers and fathers on all subscales were not significantly different, and scores did not differ by diagnosis. There was no correlation between the subscales Helplessness and Perceived Benefits (r = −.04), a weak correlation between Acceptance and Perceived Benefits (r = .28), and a moderate negative correlation between Helplessness and Acceptance (r = −.48).

Table 2

Principal component analysis with oblique rotation and three fixed factors in parents of a child recently diagnosed with cancer (N = 242) and means and standard deviations, eigenvalues, % variance explained, and Cronbach’s alpha

Item	Rotated factor loadings
	Helplessness	Acceptance	Perceived Benefits
15. My child’s illness frequently makes me feel helpless.	.37	–.40	.28
12. My child’s illness limits me in everything that is important to me.	.80	–.03	–.08
5. My child’s illness controls my life.	.55	–.28	.07
1. Because of my child’s illness, I miss the things I like to do most.	.86	.14	–.11
9. My child’s illness prevents me from doing what I would really like to do.	.87	.04	–.08
7. My child’s illness makes me feel useless at times.	.48	–.05	.18
10. I have learned to accept the limitations imposed by my child’s illness.	–.07	.65	.24
3. I have learned to live with my child’s illness.	.00	.83	–.02
13. I can accept my child’s illness well.	–.02	.78	–.04
17. I can cope effectively with my child’s illness.	.05	.85	.10
2. I can handle the problems related to my child’s illness.	–.06	.76	–.02
14. I think I can handle the problems related to my child’s illness, even if the illness gets worse.	.03	.81	–.08
4. Dealing with my child’s illness has made me a stronger person.	–.03	.47	.55
6. I have learned a great deal from my child’s illness.	.14	.16	.65
18. My child’s illness has taught me to enjoy the moment more.	–.03	–.01	.79
8. My child’s illness has made life more precious to me.	.06	–.08	.82
16. My child’s illness has helped me realize what is important in life.	–.04	–.19	.84
11. Looking back, I can see that my child’s illness has also brought about some positive changes in my life.	–.18	.16	.63
M (SD)	12.45 (3.31)	16.60 (3.93)	15.88 (4.04)
Eigenvalues	1.77	5.65	3.22
% of variance	9.83	31.38	17.90
α	.80	.88	.83

Predicting parental psychological distress

Concurrent validity was measured with Pearson’s correlation coefficients between the ICQ-P and the measures of parental psychological well-being (Table 3). As expected, cognitions of Helplessness were moderately to relatively highly (r = .42–.59) associated with a worse psychological well-being, that is, with higher levels of overall distress, depression, anxiety, tension, irritation, and fatigue, as assessed with the HADS and POMS. The opposite was seen for cognitions of Acceptance. Higher levels of Acceptance were moderately to relatively highly associated with a better psychological well-being, namely, higher levels of vigor and lower levels of overall distress, depression, anxiety, tension, irritation, and fatigue. No statistically significant correlations were found between the subscale Perceived Benefits and levels of psychological distress.

Table 3

Correlations between the Illness Cognition Questionnaire-parent version scales and measures of psychological distress

	Helplessness r	Acceptance r	Perceived Benefits r
Parental psychological well-being
HADS Totala	.46**	–.53**	–.06
HADS Depressiona	.42**	–.49**	–.10
HADS Anxietya	.45**	–.52**	–.02
POMS Tensionb	.42**	–.39**	.03
POMS Depressionb	.59**	–.54**	.02
POMS Irritationb	.54**	–.33**	.09
POMS Fatiqueb	.53**	–.29*	–.06
POMS Vigorb	–.41**	.40**	.12

HADS Total M = 13.7, SD = 7.5, range = 0–33; HADS Depression M = 6.3, SD = 4.0, range = 0–17; HADS Anxiety M = 7.4, SD = 3.9, range = 0–18; POMS Tension M = 7.5, SD = 5.2, range = 0–23; POMS Depression M = 8.9, SD = 6.3, range = 0–26; POMS Irritation M = 6.7, SD = 5.4, range = 0–22; POMS Fatigue M = 8.8, SD = 5.7, range = 0–24; POMS Vigor M = 8.5, SD = 4.3, range = 0–19

HADS Hospital Anxiety and Depression Scale, POMS Profiles of Mood States

*p < .01; **p < .001

a N = 113

b N = 126

To test criterion-related validity, we compared the illness cognitions of parents who were clinically distressed (HADS total score ≥13, N = 57) with those of non-distressed parents (HADS total score ≤12, N = 56). One month after diagnosis, clinically distressed parents had more cognitions of Helplessness (M = 13.05 vs. M = 10.41, F = 19.96, p < .001, d = 0.78) and fewer cognitions of Acceptance (M = 15.23 vs. M = 18.91, F = 28.04, p < .001, d = 0.89) than non-distressed parents. No significant results were found for Perceived Benefits.

Discussion

The results of this study confirm that the ICQ-P, which was originally developed for adult patients with a chronic disease, is suitable for assessing the cognitions of the parents of a child recently diagnosed with cancer. The same three-factor (each with 6 items) structure of the original ICQ (Helplessness, Acceptance, Perceived Benefits) was also found in two samples of parents of children recently diagnosed with cancer. Factor loadings were adequate and exceeded previously determined factor loadings, showing that the adapted ICQ (ICQ-P) had an adequate factor structure. All subscales showed high reliability (α = .80–.88), comparable to that of the original questionnaire [5]. Correlation analysis of the subscales of the ICQ-P demonstrated no association between Helplessness and Perceived Benefits, a small association between Acceptance and Perceived Benefits, and a moderate association between Helplessness and Acceptance, indicating that these factors are distinct constructs of illness cognitions.

The scores of mothers and fathers were not significantly different, consistent with an earlier study using the ICQ [5], but not with an earlier study of the parents of a child with cancer in which the Control Strategy Scale (CSS) was used [22]. Grootenhuis et al. investigated differences in control strategies in dyadic couples, and this might explain the absence of an effect in the present study. We used data obtained from one parent per child and therefore compared the scores of mothers and fathers of different families. Parental ICQ scores were not significantly different by cancer diagnosis—the parents of children with hematological, solid, or neuro-oncological tumors had similar beliefs of Helplessness, Acceptance, and Perceived Benefits. This suggests that illness cognitions are not determined by diagnosis, which was also found in a previous study [12]. Treatment intensity or survival perspective might be of influence, as suggested by a previous research [36], but we were not able to investigate this in the present study.

We found that parental illness cognitions were significantly correlated with psychological distress, with parents with beliefs of helplessness and little acceptance having a worse psychological well-being, in terms of overall distress, depression, anxiety, tension, irritation, and fatigue, than parents without these beliefs. In addition, clinically distressed parents had more helplessness cognitions and fewer acceptance cognitions than did their non-distressed counterparts. Although the data were not suitable for causal analyses, these results are in line with earlier reports on the effect of parental illness beliefs on adaptation [5, 10–12]. Perceived Benefits were not significantly associated with parental psychological distress. This lack of correlation has been reported in other studies, in which benefit was found to be associated with positive constructs, such as trait optimism, positive mood, higher quality of life, and positive reframing as coping mechanism [37, 38], and not with distress. Another possible explanation for this lack of correlation is that we included only families in which the child had recently been diagnosed with cancer, so that survival would be of key importance, finding benefit might occur later [39]. Thus, while all subscales of the ICQ-P were reliable and valid in the acute phase after the diagnosis of childhood cancer, the subscale Perceived Benefits might be more relevant in a later stage of cancer treatment. Changes in illness cognitions during long-term adjustment to disease and their predictive contribution to adjustment processes might be a topic for future research in these patient and parent groups.

The study had a number of strong points. It had a large sample, a broad range of children ages, a heterogeneous group of childhood cancer diagnoses, and mothers and fathers as respondents. However, it also had a number of limitations. First, we included the parents of children with cancer from two different studies; however, both samples completed questionnaires in the period shortly after diagnosis. While different questionnaires were used in the two studies, which reduced the sample size for analyses, similar results were obtained for both samples, which strengthened our conclusions. Although we intended to recruit both mothers and fathers, mothers were overrepresented in both samples; however, there were sufficient fathers to compare the scores of mothers with fathers. Secondly, this questionnaire was designed for the parents of sick children, and this is the only study to validate it in this population. In adults, the ICQ has proven to be reliable and valid in diverse patient groups [5], and therefore this can be expected to be the case for pediatric populations as well. Illness cognitions are generic and unrelated to medical factors, and therefore the ICQ-P should be applicable for children with chronic or life-threatening illnesses [5]. Future research should confirm the utility of this questionnaire in other pediatric populations. Thirdly, patients with a neuro-oncological diagnosis were underrepresented and patients with hematological diseases, especially ALL, were overrepresented in our sample. This is because study 1 consisted solely of ALL patients and their parents. However, we found that cancer diagnosis did not affect parental ICQ-P scores. Our cross-sectional design limits our ability to assess causal relations and the long-term effects of illness cognitions on family adjustment.

Overall, this study showed that this version of the ICQ adapted for the parents of children with a chronic illness, specifically cancer, is a reliable and valid tool to evaluate illness cognitions. Assessment of the illness cognitions of the parents of children diagnosed with cancer is clinically relevant, because it may be a predictor of psychological distress, as suggested by our findings. The availability of a short and valid parent illness cognition assessment tool makes it possible to target interventions for parents at risk of maladaptive cognitions regarding their child’s illness. Such interventions have been found to improve parental outcomes and to diminish child adjustment problems [40, 41].