Table 1.

Items used to define childhood sexual abuse in MOAFTS and MOFAM

Traumatic events (Waves 1, 3, and 4 of MOAFTS; all waves of MOFAM)

Endorsement of event 1 or 2, with reported age at first experience 15 years or younger

1. Raped

2. Sexually molested

Health problems and health habits (Waves 1, 3, and 4 of MOAFTS; all waves of MOFAM)

Endorsement of item, with reported age at first experience 15 years or younger Has anyone ever forced you to have sexual intercourse?

Parental discipline and early childhood experiences (Wave 4 of MOAFTS)

Endorsement of item 1 or 2

1. Before you turned 16, was there any forced sexual contact between you and any family member like a parent or stepparent, grandfather, etc.? By sexual contact, I mean their touching your sexual parts, your touching their sexual parts, or intercourse.

2. Before you turned 16, was there any forced sexual contact between you and anyone who was 5 or more years older than you (other than a family member)?

Notes: MOAFTS = Missouri Adolescent Female Twin Study; MOFAM = Missouri Family Study.