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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 & Pencil Interview (PAPI)
Supplementary information from parents on mailed questionnaire

Correlate

Authors's Label
Sex
Our Classification
Distribution
N for  happiness = A: 334, Aa: 204, Ab: 130, B: 472, Ba: 282, Bb: 190
N for percentages cheerful & satisfied = A: 351, Aa: 216, Ab: 135, B: 488, Ba: 293,  Bb: 195
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.