Study Rothbart (1981): study US Oregon 1976
- Public
- 3-12 months aged infants, Oregon, United States, 197?
- Survey name
- Unnamed study
- Sample
- Respondents
- N = 215
- Non Response
- 41%
- Assessment
- Behavioural observation
Correlate
- Authors's Label
- Stability
- Our Classification
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-
- Remarks
- Cohort 1: completed IBQ at 3, 6, 9 & 12 months Cohort 2: completed IBQ at 6, 9 & 12 months Cohort 3: completed IBQ at 9 & 12 months all Stability Correlations two-tailed tested
- Operationalization
- Intercorrelation of 15 ratings of happy appearance (smiling and laughter) at different months of age
Observed Relation with Happiness
3-6 months: r=+.60
3-9 months: r=+.63
3-12 months: r=+.57
6-9 months: r=+.81
6-12 months: r=+.78
9-12 months: r=+.80
6-9 months: r=+.73
6-12 months: r=+.66
9-12 months: r=+.78