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Correlational findings

Study Loehlin & Nichols (1976): study US 1963

Public:
Adolescent same-sex twins, USA, 1963
Sample:
Respondents:
N = 850
Non Response:
29 %
Assessment:
Questionnaire: paper
Supplementary information from parents on mailed questionnaire

Correlate

Authors's label
Sex
Our Classification
Operationalization
A Males
  Identical twins
  Fraternal twins

B Females
  Identical twins
  Fraternal twins

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks O-HP-g-sq-v-7-a DM = p < .05              Identical Fraternal  All
Male twin    M = 6,11  M = 6,03   M = 6,08
Female twin  M = 6,28  M = 6,12   M = 6.22
O-HP-g-sq-v-2-b D% = p < .05 % cheerful   Identical Fraternal  All
Male twin    65%       69%        67%
Female twin  77%       76%        77%

Gender difference among fraternal twins ns
O-HP-g-sq-v-2-c D% = p < .05 % satisfied  Identical  Fraternal All
Male twin    83%        75%       80%
Female twin  77%        81%       79%

Significance tests computed by us, assuming that these samples are a probability sample of a wider population of twins.