Psychometric properties of the forensic inpatient quality of life questionnaire: quality of life assessment for long-term forensic psychiatric care

Figures & data

Table 1. Descriptives and reliability per FQL domain.

N = 163	No. of VAS items	n	Mean (SD)	Cronbach's alpha	Mean inter-item correlation
(1) Activities	15	147	54 (20)	.89	.36
(2) Leave	2	112	34 (36)	.87	.77
(3) Residence	18	157	58 (22)	.91	.36
(4) Nutrition	3	160	47 (25)	.82	.61
(5) Hygiene	2	162	81 (23)	.72	.58
(6) Health	11	150	58 (19)	.77	.23
(7) Sexuality	2	146	32 (37)	.88	.79
(8) Social relations	8	156	64 (20)	.74	.27
(9) Other residents	6	156	54 (18)	.69	.28
(10) Daily staff	16	148	57 (19)	.89	.34
(11) Affection	14	156	58 (22)	.91	.41
(12) Self-actualisation	7	157	62 (17)	.70	.25
(13) Autonomy	4	159	63 (24)	.77	.45
(14) Finances	2	161	64 (22)	.06	.03
(15) Religion	2	150	63 (32)	.73	.58
(16) Overall QoL	3	159	44 (27)	.86	.67

Note: Domains with poor reliability (Cronbach's alpha <.70 and MIIC <.15 or >.50) are shown in italic typeface.

Figure 1. Screeplot of the eigenvalues for factor analysis of the FQL.

Table 2. Exploratory factor analysis: varimax rotation of three-factor solution for FQL domains (N = 163).

	Factor 1	Factor 2	Factor 3
Health	.75	.34	.11
Residence	.72	.31	.14
Activities	.71	.42	.23
Hygiene	.69	.04	−.36
Religion	.68	.13	−.11
Nutrition	.68	.04	.26
Daily staff	.62	.44	.19
Self-actualisation	.52	.31	.13
Sexuality	−.00	.70	.26
Social relations	.17	.70	−.33
Affection	.35	.68	.07
Other residents	.32	.66	−.22
Autonomy	.51	.57	.29
Leave	.19	.01	.85
% of variance explained	29.8%	20.6%	9.8%

Note: Domains are in boldface to indicate on which factor they had the highest loading.

Table 3. Intrascale Pearson's correlations of the FQL (N = 163).

	1	2	3	4	5	6	7	8	9	10	11	12	13	14
(1) Activities	–
(2) Leave	.29^b	–
(3) Residence	.64^b	.25^a	–
(4) Nutrition	.55^b	.28	.47^b	–
(5) Hygiene	.35^b	−.05	.49^b	.30^b	–
(6) Health	.70^b	.22	.58^b	.50^b	.41^b	–
(7) Sexuality	.35^b	.14	.30^b	.16	.09	.24^a	–
(8) Social relations	.36^b	−.14	.27^b	.12	.20	.39^b	.28^b	–
(9) Other residents	.45^b	−.02	.46^b	.19	.31^b	.36^b	.31^b	.41^b	–
(10) Daily staff	.60^b	.26^a	.54^b	.35^b	.30^b	.68^b	.22	.36^b	.41^b	–
(11) Affection	.46^b	.15	.37^b	.32^b	.25^a	.48^b	.36^b	.41^b	.53^b	.51^b	–
(12) Self-actualisation	.45^b	.07	.44^b	.34^b	.26^a	.44^b	.19	.16	.24^a	.47^b	.49^b	–
(13) Autonomy	.64^b	.28^a	.57^b	.41^b	.33^b	.53^b	.41^b	.39^b	.42^b	.61^b	.48^b	.52^b	–
(14) Religion	.52^b	.10	.39^b	.36^b	.37^b	.51^b	.16	.24^a	.32^b	.45^b	.33^b	.29^b	.29^b	–
(15) Overall QoL	.61^b	.22	.54^b	.43^b	.15	.55^b	.26^a	.12	.23^a	.53^b	.37^b	.45^b	.55^b	.27^a

Note: Strong correlations (r ≥ .5) are shown in bold typeface.

^aCorrelations are significant at the .01 level (two-tailed).

^bCorrelations are significant at the .001 level (two-tailed).

Table 4. Construct validity as measured by Pearson's correlation between FQL domains and the WHOQOL-Bref (n = 48), and the ABS (n = 43).

	WHOQOL-Bref				ABS
	Physical health	Psychological health	Social relations	Environment	Positive affect	Negative affect
(s1) Activities	.42^a	.42^a	.56^b	.73^b	.62^b	−.29
(2) Leave	.00	−.04	.06	.13	.10	−.55
(3) Residence	.31	.37^a	.17	.53^b	.53^b	−.37
(4) Nutrition	.06	.30	.22	.31	.44^a	−.39^a
(5) Hygiene	.28	.25	.16	.22	.42^a	−.33
(6) Health	.52^b	.34	.46^a	.44^a	.62^b	−.40
(7) Sexuality	−.02	.32	.49^b	.35	.34	−.06
(8) Social Relations	.37	.33	.36	.29	.29	−.26
(9) Other residents	.28	.17	.26	.21	.42^a	−.03
(10) Daily staff	.38^a	.36	.42^a	.50^b	.65^b	−.33
(11) Affection	.41^a	.42^a	.64^b	.45^a	.28	−.05
(12) Self-actualisation	.39^a	.44^a	.28	.25	.45^a	−.06
(13) Autonomy	.40^a	.38^a	.43^a	.56^b	.58^b	−.20
(14) Religion	.31	.23	.18	.27	.36	−.17
(15) Overall QoL	.35	.46^b	.34	.59^b	.66^b	−.43^a

Note: Appropriately a priori predicted correlations are shown in bold typeface.

^aCorrelations are significant at the .01 level (two-tailed).

^bCorrelations are significant at the .001 level (two-tailed).