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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 & Pencil Interview (PAPI)

Correlate

Authors's Label
first-born girl
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 = +.20 (01)
males aged 50-70 years: Beta = +.10 (ns) O-SLu-u-sq-v-4-g Beta = -/+ s Beta’s controlled for:
- number of additional children
- currently in partnership

females aged 25-45 years: Beta = +.14 (05)
males aged 50-70 years: Beta = -.02 (ns) O-SLu-u-sq-v-4-g = BETWEEN SUBJECTS DIFFERENCE IN HAPPINESS O-SLu-u-sq-v-4-g = Regression across all subjects yield similar results, except:
- females, controlled for first-born boy and number of additional children Beta = +.11 (01)
- males, controlled for first-born boy and number of additional children Beta = +.16 (01)