Appendix 1.

Survey items, by question theme

Theme 1: Health care confidence

I don’t get what I need from my doctor because I am not assertive enough

I am more assertive about my health care needs than most trans women

If my doctor prescribes something I don’t understand or agree with, I question it

If my doctor prescribes something I don’t understand or agree with, I am likely not to take it

I don’t always do what my doctor or health care worker asks me to do

Theme 2: Health care experiences

I don’t want to talk with my doctor about my sex life

I am afraid I would feel judged by the doctor and other people who work in a doctor’s office (like front desk staff) so I don’t want to go and ask for PrEP

Doctors don’t want to treat people like me

My doctor always explains things in a way I can understand

I feel my doctor accepts and supports me completely

I have had positive interactions with the staff at my doctor’s office or clinic (like nurses, aides, front desk staff)

I’m comfortable talking with my doctor

I am more likely to take my doctor’s advice if I feel they do not judge me

I feel my doctor listens to me and does not rush me

My doctor or other health care provider has misgendered me

My provider has referred to me as a man

I would prefer to get PrEP from the same doctor who gives me my hormones

I know where to get PrEP in a gender affirming environment

I worry that other doctors or health care providers will think I’m HIV positive if I’m taking PrEP

Theme 3: PrEP beliefs

If I use PrEP, my sex partner(s) might think I will give them HIV

I don’t trust how effective they say PrEP is

I feel healthy so I don’t need to take PrEP

I don’t think PrEP really works

People from my race/ethnicity are more likely to need to take PrEP

PrEP sounds “too good to be true”

I’m worried I won’t take PrEP correctly and then I will get HIV

I have a lot more important worries in my life than getting HIV

PrEP makes people think they are invincible (like they can’t get HIV or other STIs)