- Infants followed from birth to 8 month, USA, 196?
- N = 24
- Non Response
- 46% unattainable.
Questionnaire: Paper & Pencil Interview (PAPI)
Mailed questionnaire and peerratings
- Authors's Label
- Our Classification
- Examination by psychologist. Rated on 8-point scale. (Tension rating scale, from Bayley Infant Behaviour Profile).