Table 3.

Item raw scores, logit measures and fit statistics for the Autism-Spectrum Quotient

	All			ASD		Non-ASD
	Item logit measure	Infit mean square	Outfit mean square	Mean raw score	Item logit measure	Mean raw score	Item logit measure
Social skill
1 I prefer to do things with others rather than on my own	−0.06	0.68	0.68	2.61	−0.06	2.06	−0.06
11 I find social situations easy	0.37	0.71	0.69	2.58	−0.03	1.53	0.73
13* I would rather go to a library than a party	0.53	1.25	1.16	2.55	0.01	1.37	1.10
15 I find myself drawn more strongly to people than to things	−0.03	0.71	0.71	2.80	−0.28	1.91	0.13
22* I find it hard to make new friends	0.47	1.02	0.98	2.55	0.00	1.43	0.93
36 I find it easy to work out what someone is thinking or feeling	−0.29	0.75	0.74	2.90	−0.39	2.21	−0.23
44 I enjoy social occasions	0.80	0.73	0.69	2.16	0.44	1.32	1.22
45* I find it difficult to work out people’s intentions	0.18	0.57	0.57	2.54	0.02	1.79	0.29
47 I enjoy meeting new people	0.45	0.71	0.69	2.48	0.08	1.49	0.80
48 I am a good diplomat	−0.08	0.91	0.93	2.48	0.08	2.17	−0.18
Attention switching
2* I prefer to do things the same way over and over again	−0.24	0.62	0.62	2.60	−0.05	2.33	−0.35
4* I frequently get strongly absorbed in one thing	−0.45	1.01	1.02	2.93	−0.43	2.43	−0.45
10 I can easily keep track of several different people’s conversations	−0.28	0.81	0.81	2.99	-0.51	2.15	−0.15
16* I tend to have very strong interests	−0.47	0.90	0.92	2.82	−0.30	2.53	−0.56
25 It does not upset me if my daily routine is disturbed	−0.36	1.16	1.21	2.71	−0.17	2.44	−0.47
32 I find it easy to do more than one thing at once	−0.27	0.85	0.88	3.04	−0.57	2.11	−0.11
34 I enjoy doing things spontaneously	0.03	0.75	0.74	2.64	−0.09	1.93	0.11
37 If there is an interruption, I can switch back very quickly	−0.31	0.67	0.67	2.86	−0.35	2.26	−0.28
43* I like to plan any activities I participate in carefully	−0.43	0.84	0.83	2.96	−0.47	2.38	−0.43
46* New situations make me anxious	−0.42	0.76	0.76	3.08	−0.62	2.29	−0.31
Communication
7* Other people frequently tell me that what I have said is impolite	0.85	1.04	1.02	1.91	0.76	1.43	0.93
17 I enjoy social chit-chat	−0.14	0.85	0.85	2.79	−0.27	2.07	− 0.06
18* When I talk, it isn’t always easy for others to get a word in edgeways	0.57	1.21	1.27	1.87	0.82	1.73	0.38
26* I don’t know how to keep a conversation going	0.17	0.87	0.86	2.59	−0.04	1.77	0.32
27 I find it easy to ‘‘read between the lines’’	−0.23	0.80	0.81	2.76	−0.23	2.21	−0.23
31 I know how to tell if someone listening to me is getting bored	0.06	0.81	0.81	2.67	−0.13	1.86	0.19
33* When I talk on the phone, I am not sure when it’s my turn to speak	0.85	1.05	0.99	1.93	0.73	1.42	0.96
35* I am often the last to understand the point of a joke	0.53	1.31	1.30	2.03	0.60	1.67	0.47
38 I am good at social chit-chat	−0.19	0.73	0.72	2.88	−0.38	2.08	−0.08
39* People tell me that I keep going on and on about the same thing	0.70	1.21	1.19	2.02	0.62	1.50	0.78
Imagination
3 Trying to imagine something, I find it easy to create a picture in my mind	0.36	0.83	0.81	2.18	0.42	1.78	0.31
8 Reading a story, I can easily imagine what the characters might look like	0.31	1.04	1.02	2.25	0.35	1.79	0.29
14 I find making up stories easy	−0.52	1.34	1.39	2.55	0.00	2.75	−0.81
20* Reading a story, I find it difficult to work out the characters’ intentions	0.62	0.79	0.79	1.92	0.74	1.65	0.51
21* I don’t particularly enjoy reading fiction	0.13	1.65	1.65	2.30	0.29	2.00	0.02
24 I would rather go to the theatre than a museum	−0.52	1.25	1.25	3.15	−0.71	2.40	−0.43
40 When younger, I enjoyed playing games involving pretending with other children	−0.39	1.25	1.26	2.78	−0.26	2.43	−0.47
41* I like to collect information about categories of things	0.58	1.29	1.22	2.24	0.36	1.50	0.78
42* I find it difficult to imagine what it would be like to be someone else	0.08	1.05	1.06	2.38	0.19	2.01	0.01
50 I find it easy to play games with children that involve pretending	−0.59	1.03	1.02	2.99	−0.51	2.59	−0.63
Attention to detail
5* I often notice small sounds when others do not	−0.26	1.15	1.15	2.89	−0.39	2.18	−0.19
6* I usually notice car number plates or similar strings of information	−0.30	1.25	1.27	2.74	−0.21	2.33	−0.42
9* I am fascinated by dates	0.99	1.53	1.58	1.58	1.27	1.51	0.84
12* I tend to notice details that others do not	−0.76	1.05	1.03	3.05	−0.58	2.79	−0.97
19* I am fascinated by numbers	0.40	1.39	1.39	1.77	0.69	1.97	0.04
23* I notice patterns in things all the time	−0.09	1.12	1.13	2.30	0.29	2.29	−0.37
28 I usually concentrate more on the whole picture, rather than the small details	−0.40	0.84	0.87	2.89	−0.40	2.37	−0.47
29 I am not very good at remembering phone numbers	−0.46	1.54	1.62	2.48	0.09	2.72	−0.88
30 I don’t usually notice small changes in a situation, or a person’s appearance	−1.11	1.44	1.92	3.02	−0.55	3.24	−1.59
49 I am not very good at remembering people’s date of birth	−0.41	1.58	1.71	2.48	0.08	2.63	−0.67

*Designates a reverse-scored item. Bold designates misfit items. Higher item logits denotes a more “difficult” item. Higher mean raw score denotes higher degree of autistic traits. (Logit log-odd unit, ASD autism spectrum disorder)