Supplemental Material for Development and Validation of the Trans- and Nonbinary-Affirming Parental Practices (TAPP) Measure

Table S1.All Original 20 TAPP Items 1. Told my child I support their gender identity.2. Practices using my child's preferred name/pronouns when they are not around.3. Stood up to family or friends who disrespect my child.4 Researched options for medical transition related procedures. 5. Avoided talking to my child about their gender (R) 6. Told my child I appreciate their clothing and hairstyle, even if it's not typical for their assigned gender.7. Continued to use the name and pronouns my child was given at birth (R) 8. Advocate for my child if they are mistreated.9. South advice from a trans-affirming therapist.10 .Told my child I love them unconditionally.11.Supported my child's gender expression.[Excluded] 12. Apologized when I made mistakes with my child's name or pronouns.[Excluded] 13.Intervened if someone makes a negative comment about my child.14 Sought advice from a trans-affirming medical provider.15.Used my child's preferred name and pronouns.16.