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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
Number of additional children
Our Classification
Operationalization
number of children - 1

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:
- first-born boy
- first-born girl

- females aged 25-45 years: Beta = -.07 (05)
- males aged 50-70 years: Beta = +.02 (ns)

Regression analysis with following controlled variables yield similar results:
- first born boy/girl, currently in partnership
O-SLu-u-sq-v-4-g = BETWEEN SUBJECTS DIFFERENCE IN HAPPINESS O-SLu-u-sq-v-4-g = Regressions across all subjects yield similar results, except:
- females, controlled for first-born boy and first-born girl Beta = -.01 (ns)
- females, controlled for first-born boy, first-born girl and currently in partnership Beta = -.03 (ns)