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Correlational findings

Study Kohler et al. (2005): study DK 2002

Public:
20-70 aged identical twins, Denmark, 2002
Sample:
Respondents:
N = 3226
Non Response:
26%
Assessment:
Questionnaire: paper

Correlate

Authors's label
first-born boy
Our Classification
Operationalization
0 no
1 yes

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks O-SLu-u-sq-v-4-g = WITHIN MONOZYGOTIC TWIN-PAIR DIFFERENCE IN HAPPINESS O-SLu-u-sq-v-4-g Beta = + s Beta’s controlled for:
- number of additional children

- females aged 25-45 years: Beta = +.23 (01)
- males aged 50-70 years: Beta = +.17 (05)
O-SLu-u-sq-v-4-g Beta = + s Beta’s controlled for:
- first-born girl
- number of additional children
- currently in partnership

- females aged 25-45 years: Beta = +.18 (01)
- males aged 50-70 years: Beta = +.05 (ns)
O-SLu-u-sq-v-4-g = BETWEEN ALL SUBJECTS DIFFERENCE IN HAPPINESS O-SLu-u-sq-v-4-g = Regressions across all subjects yield different results:
- females, controlled for first-born girl and number of additional children Beta = +.11 (01)
- males, controlled for first-born girl and number of additional children Beta = +.24 (01)
- females, controlled for first-born girl, number of additional children and currently in partnership Beta = +.03 (ns)
- males, controlled for first-born girl, number of additional children and currently in partnership Beta = +.13 (05)