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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
Being an identical or fraternal twins
Our Classification
Remarks
All twins are same sex.
Distribution
N for happiness means = A: 486, Aa: 204, Ab: 282, B: 320, Ba: 130, Bb: 190
N for % cheerful & satisfied = A: 509, Aa: 216, Ab: 293, B: 330, Ba: 135,  Bb: 195
Operationalization
A Identical twins
  a male
  b female
B Fraternal twins
  a male
  b female

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks O-HP-g-sq-v-7-a DM = ns                 male      female     all
Identical twin  M = 6,11  M = 6,28   M = 6,21
Fraternal twin  M = 6,03  M = 6,12   M = 6,08 O-HP-g-sq-v-2-b D% = ns % cheerful           male      female     all
Identical twin       65%        77%       72%
Fraternal twin       69%        76%       73% O-HP-g-sq-v-2-c D% = ns % satisfied          male      female     all
Identical twin       83%        77%       80%
Fraternal twin       75%        81%       79%

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