Psychometric properties of the self-rating organization scale with adult samples

Figures & data

Table 1 Comparison of tentative SOS items between three groups

Item	ADHD (n=47)		Adult (n=113)		Student (n=857)		F	ADHD vs adult	ADHD vs student
	M	SD	M	SD	M	SD
1	2.34	1.07	1.27	0.89	1.37	1.03	21.48	*	*
2	2.68	1.12	1.31	0.85	1.59	0.98	33.85	*	*
3	2.45	1.35	1.66	1.28	1.58	1.08	13.67	*	*
4	1.15	1.18	0.72	1.19	1.01	1.09	4.04	*
5	2.09	1.27	1.42	1.07	1.68	1.19	5.41	*
6	2.15	1.23	1.36	1.30	1.67	1.27	6.57	*	*
7	1.91	1.12	0.79	0.74	0.95	0.97	25.26	*	*
8	1.15	1.00	0.99	1.09	1.08	1.00	0.53	*	*
9	2.57	1.16	1.15	1.05	1.59	1.18	24.91	*	*
10	2.40	1.14	1.19	1.15	1.49	1.29	15.33	*
11	2.26	1.37	1.50	1.29	2.17	1.29	13.92	*	*
12	2.13	1.24	1.79	1.12	1.62	1.15	4.94	*	*
13	2.60	1.36	1.72	1.25	2.21	1.29	9.88	*
14d	1.55	1.28	0.87	1.04	0.80	0.94	13.64	*	*
15	2.11	1.48	1.84	1.28	2.54	1.28	16.60	*
16	2.70	1.33	2.30	1.01	2.64	1.14	4.68	*
17	2.23	1.31	1.24	1.02	1.20	1.04	21.27	*
18	2.28	1.14	1.58	1.26	1.90	1.15	6.69	*	*
19d	0.53	0.83	0.48	0.72	0.62	0.83	1.58
20	2.51	1.18	1.11	0.86	1.32	0.98	37.04	*	*
21	2.17	1.24	1.13	0.98	1.34	1.11	15.30	*	*
22	2.51	1.12	1.47	1.00	1.60	1.08	17.38	*	*
23	2.26	1.15	1.26	0.75	1.67	0.98	18.77	*	*
24	1.87	1.38	1.10	0.94	1.43	1.18	7.92	*	*
25	2.32	1.30	1.33	1.26	1.45	1.22	12.01	*	*
26d	0.60	1.12	0.30	0.55	0.53	0.75	4.95	*	*
28	2.21	1.43	1.11	1.02	1.32	1.23	14.30	*	*
29	2.13	1.42	1.78	1.05	1.71	1.29	2.44

Notes:

* The ADHD group is significantly higher than the relevant group.

d indicates a dummy item.

Abbreviations: SOS, self-rating organization scale; ADHD, attention-deficit hyperactivity disorder; M, mean; SD, standard deviation.

Table 2 Summary of exploratory factor analysis results for the SOS using maximum likelihood estimation (n=1,017)

Item	Factor loadings
	I (MD)	II (TD)	III (Mess)
17	0.789	0.034	−0.116
7	0.700	0.051	−0.064
21	0.674	0.029	0.061
3	0.668	−0.030	0.027
2	0.646	0.047	0.114
1	0.621	−0.009	0.189
23	0.601	−0.117	0.162
27	0.512	−0.001	0.126
9	0.050	0.660	−0.007
5	−0.171	0.654	−0.055
4	0.246	0.631	−0.284
6	0.144	0.602	0.053
18	0.189	0.598	0.103
16	−0.302	0.592	0.117
12	0.206	0.532	−0.211
15	−0.235	0.440	0.131
13	−0.014	−0.036	0.799
28	0.068	0.049	0.731
24	0.094	0.023	0.728
29	0.101	−0.164	0.621
25	0.245	−0.024	0.567
11	−0.172	0.454	0.492
Eigen values	5.76	2.89	1.57
% of variance	26.18	13.14	7.15
Factor correlations	I	II	III
I	–	0.110	0.450
II		–	0.230
III			–

Note: Factor loadings >0.40 appear in bold.

Abbreviations: SOS, self-rating organization scale; MD, materials disorganization; TD, temporal disorganization.

Table 3 Comparison of total and factor scores of the SOS between three groups

	ADHD (n=47)		Adult (n=113)		Student (n=857)		F	ADHD vs adult	ADHD vs student
	M	SD	M	SD	M	SD
Total	48.59	14.12	30.15	12.17	35.44	11.98	37.78	*	*
MD	18.04	7.30	9.54	5.26	10.48	5.62	42.46	*	*
Mess	13.38	5.18	8.44	4.83	10.28	5.27	15.29	*	*
TD	17.17	4.83	12.17	5.55	14.68	5.55	18.41	*	*
Dummy	2.68	2.49	1.65	1.81	1.94	1.92	4.90	*	*

Note:

* The ADHD group is significantly higher than the relevant group.

Abbreviations: SOS, self-rating organization scale; ADHD, attention-deficit hyperactivity disorder; MD, materials disorganization; TD, temporal disorganization.

Table S1 Self-rating organization scale

Item	Description
1	I have trouble finding my things in school or workplace when I need them.
2	I forgot to do my jobs (task, homework, assistance, and choirs) at home.
3	When I cannot find something I need, I quickly get upset.
4	I show up on time for school or workplace.^r
5	I make plans for what I am going to do after school or job.^r
6	I put my belongings in the same place when I come home from school or workplace.^r
7	I do my homework or task but cannot find it when it is due.
8	I have difficulty getting to classes or meetings on time.^#
9	I have a plan for deciding which homework or task assignment to do first.^r
10	I put my homework or task in the same place in my notebook, textbook, or document.^r^,#
11	At the end of the day, I hang up my clothes or put them away immediately after I take them off.^r
12	I am one of the first people to be at a meeting place with my friends.^r
13	I would keep my room messy, if I were allowed.
14	My family puts things where I cannot find them.^d
15	When I have several things to do in a day, I make a list or put notes around.^r
16	I make plans for what I am going to do at recess or lunch.^r
17	I lose things at school or workplace.
18	After I use something, I put it back where it belongs.^r
19	Other kids or colleagues lose my things.^d
20	I start projects or tasks but have a hard time finishing them.^#
21	I have trouble remembering where I put things at home that I need everyday (like keys).
22	I often act or say things before I think.^#
23	I do not realize that I have forgotten something until I am already at school or workplace.
24	My clothes are crumpled and messy.
25	I keep my school or job stuff in my desk at school or workplace messy.
26	Kids at school or colleagues at workplace mess up my stuff.^d
27	When I tidy up, some of the same items appear.
28	There is no space to walk on the floor at home because I put plenty of things directly on the floor.
29	Things pile up in my room because I have trouble in throwing things away.

Notes: Low scores indicated a lower occurrence of the behavior. Items with “r” are reverse coded; a high score is equivalent to “never”. Items with a “#” were deleted from the scale. Items with “d” are dummy items.