Construct validity of a revised version of the Occupational Balance Questionnaire

Figures & data

Table 1. The OBQ items (short form).

Item number	Item
1	Having just enough to do during a regular week
2	Balance between doing things for others and for oneself
3	Perceiving one’s occupations as meaningful
4	Time for doing things wanted
5	Balance between work, home, family, leisure, rest, and sleep
6	Balance between doing things alone and with others
7	Have sufficient time for doing obligatory occupations
8	Balance between physical, social, mental, and restful occupations
9	Satisfaction with how time is spent in everyday life
10	Satisfaction with the number of activities during a regular week
11	Balance between obligatory and voluntary occupations
12	Balance between energy-giving and energy-taking activities
13	Satisfaction with time spent in rest, recovery, and sleep

Table 2. Overall Rasch model fit statistics and reliability.

	Sample 1. 13 items, 6 response categories	Sample 2. 13 items, 4 response categories	Sample 2. 11 items, 4 response categories (OBQ11)
Item fit residuals
Mean^a	−0.148	−0.039	−0.025
SD^b	3.254	1.793	1.149
Person fit residuals
Mean^a	−0.641	−0.310	−0.377
SD^b	1.795	1.345	1.488
Total item-trait interaction
Total item Chi^2 (df)	121.16 (39)	86.48 (39)	18.21 (22)
p-value^c	<0.001	<0.001	0.693
Reliability^d
Person separation index	0.93	0.92	0.92
Targeting^e
Person location, mean (SD)	1.331 (1.540)	0.480 (1.750)	0.300 (1.829)

^a Should be close to 0.

^b Should be close to 1.

^c Should be >0.05 to suggest model fit at all levels of balance and over all items.

^d Person Separation Index, should be > 0.8, relative to the mean item logit location (i.e. zero).

Table 3. Rasch item and fit statistics.

Item	OBQ with 13 items, 6 response categories (Sample 1)				OBQ with 13 items, 4 response categories (Sample 2)				OBQ11 with 11 items, 4 response categories (Sample 2)
	Location order	Item location (SE)	Fit residual^a	Chi-sq^b (p-value^c)	Location order	Item location (SE)	Fit residual^a	Chi-sq^b (p-value^c)	Location order	Item location (SE)	Fit residual^a	Chi-sq^b (p-value^c)
1	9	0.178 (0.052)	−0.672	0.761 (0.859)	10	0.516 (0,113)	0.320	2.573 (0.276)	9	0.304 (0.119)	1.080	1.546 (0.462)
2	3	−0.234 (0.055)	3.552	19.358 (<0.001)	3	0.137 (0.117)	−0.297	0.874 (0.646)	4	−0.097 (0.123)	0.673	0.724 (0.696)
3	1	−0.690 (0.056)	1.866	3.074 (0.307)	1	−2.188 (0.127)	4.043	18.171 (<0.001)	−	−	−	−
4	2	−0.425 (0.054)	0.918	1.477 (0.688)	13	0.774 (0.130)	0.768	3.453 (0.178)	1	−1.022 (0.135)	1.905	2.498 (0.287)
5	11	0.224 (0.052)	−1.274	3.375 (0.337)	12	0.577 (0.123)	−1.659	3.682 (0.159)	11	0.378 (0.129)	−1.678	2.761 (0.251)
6	4	−0.098 (0.053)	1.566	3.036 (0.386)	5	0.305 (0.116)	2.902	17.419 (<0.001)	−	−	−	−
7	5	−0.074 (0.051)	3.866	17.711 (<0.001)	4	0.140 (0.121)	−0.521	0.495 (0.781)	3	−0.111 (0.127)	−0.432	0.483 (0.786)
8	8	0.157 (0.055)	−3.141	6.767 (0.080)	7	0.427 (0.125)	−0.884	2.207 (0.331)	6	0.199 (0.130)	−0.020	0.930 (0.628)
9	6	0.017 (0.054)	−4.683	18.159 (<0.001)	9	0.502 (0.122)	−2.263	11.962 (0.003)	8	0.300 (0.127)	−1.783	4.352 (0.113)
10	12	0.243 (0.049)	0.696	2.479 (0.479)	2	−0.375 (0.126)	−0.035	0.665 (0.717)	2	−0.651 (0.131)	0.904	0.817 (0.665)
11	10	0.200 (0.053)	−5.646	18.705 (<0.001)	6	0.343 (0.121)	−1.130	3.472 (0.176)	5	0.109 (0.127)	−0.641	2.209 (0.331)
12	13	0.439 (0.053)	−3.105	11.532 (0.009)	11	0.536 (0.121)	−1.706	5. 418 (0.067)	10	0.324 (0.126)	−0.642	0.912 (0.634)
13	7	0.063 (0.051)	4.138	14.728 (0.002)	8	0.465 (0.107)	−0.041	0.163 (0.921)	7	0.267 (0.113)	0.362	0.980 (0.613)

^a Should be between −2.5 and 2.5, item misfit is shown in bold.

^b Summarize the deviation of observed from expected responses across sample class intervals. Bonferroni corrected statistically significant (at a level of <0.05) deviations across class intervals, indicating item misfit and bolded in the table.

^c Should be non-significant, Bonferroni corrected (each item’s fit to the model).

Figure 1. Response category thresholds for each item (in location order from easiest to hardest to achieve) on the Occupational Balance Questionnaire with four response categories and 13 items.

Figure 2. Distribution of locations of persons (upper panel) and response category thresholds (lower panel) in sample 2 (OBQ11, 11 item and 4 response categories).