Table A1.

Interview Schedule Used with Autistic and Neurotypical Women, with Main Questions and Prompts

Key question	Question prompts
Can you tell me a bit about your friends?	Do you have many friends? Where do you see them? How often? What do you do with your friends? Do you use the Internet to keep in touch with friends? Are you happy with the friends you have? How have these things changed since you were a teenager?
What does being a friend mean to you?	How do you know when someone is your friend? What is a good friend? Are there some friends who are more important than others? Why? Have you ever had not-so-good friends, or people who pretended to be your friend? How do you choose your friends? Is this different to when you were a teenager?
Can you tell me some good things and some difficult things about your friends?	Do your friends help you? Do you argue with your friends? How do you try to deal with that? Has how you respond to conflict and arguments changed since you were younger?
What about romantic relationships?	Are you dating? If not, would you like to in the future? How is someone you date different to a friend? How has dating changed for you since you were a teenager?
Can you tell me about a time when something bad happened with your friends, or when your friends did something you did not like? Can you tell me about a time when you had a lot of fun with your friends, or when something good happened with them? (same prompt questions)	Why do you think it happened? What did you do? What happened afterward? Did you sort it out? How? How did you feel? Did people remember? Did it change your friends? Would you do anything different if it happened again?
Is there anything else you think it would be interesting for me to know about your friendships or how you get on with people?