Appendix Table A1.

 Modified Girls Questionnaire for Autism Spectrum Condition Scale

Modified GQ-ASC	Definitely disagree	Slightly disagree	Slightly agree	Definitely agree
Imagination and play
1. (R) I enjoy fantasy worlds	1	2	3	4
2. (R) I am interested in fiction	1	2	3	4
3. (R) When I was 5 –12 years old, I played as imaginatively as other girls	1	2	3	4
4. (R) When I was 5–12 years old, I had imaginary friends or imaginary animals	1	2	3	4
5. (R) When I was 5–12 years old, I created my own complex “setups” with toys	1	2	3	4
Camouflaging
6. I copy or “clone” myself on other females	1	2	3	4
7. I avidly observe other females socializing	1	2	3	4
8. I am attracted to females with strong personalities who tell me what to do	1	2	3	4
9. I adopt a different persona in different situations	1	2	3	4
Sensory sensitivities
10. I am attached to certain objects or toys (e.g., favorite toy, pillow, piece of cloth) which I carry, touch, or rub to calm myself	1	2	3	4
11. I expressed distress during grooming (e.g., I fought or cried during fingernail cutting, haircutting, combing) or when I am touched (e.g., someone touches my feet)	1	2	3	4
12. Some social situations make me mute	1	2	3	4
13. I am distressed by certain smells or I avoid certain tastes that are a typical part of a diet	1	2	3	4
Socializing
14. I socialize quite well for a while, but subsequently feel exhausted	1	2	3	4
15. I often have a facial “mask” that hides my social confusion	1	2	3	4
16. I have intense emotions	1	2	3	4
17. I apologize when I make a social error	1	2	3	4
Interests
18. (R) When I was 5–12 years old, I preferred to play with girls' toys	1	2	3	4
19. When I was 5–12 years old, I preferred to play with boys' toys	1	2	3	4
20. My interests were advanced for my age (e.g., opera)	1	2	3	4
21. I am talented in music	1	2	3	4

Items 1,2,3,4,5,18 to be reverse scored. A total score of >56 sensitive to 80% of cases.

GQ-ASC, Girls Questionnaire for Autism Spectrum Condition.