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Correlational findings

Study Liu et al. (2015a): study GB 1996

Public:
Female, aged 50-69, United Kingdom, 1996-2001
Sample:
Respondents:
N = 1300000
Non Response:
Assessment:
Questionnaire: paper
At recruitment, and every 3-5 years subsequently women were posted a quaestionnaire asking about sociodemographic factors, lifestyle and health.

Correlate

Authors's label
Sleep duration
Our Classification
Operationalization
Sleep duration:
a: <7h
b: 7h (Reference)
c: 8h
d: >=9h

Observed Relation with Happiness

Happiness Measure Statistics Elaboration / Remarks M-TH-u-sq-v-4-d OR = +/- p < .01 <7h (vs. 7h):  OR= 0.597 CI99[0.589-0.605]
8h (vs. 7h):   OR= 1.196 CI99[1.179-1.213]
>=9h (vs. 7h): OR= 0.893 CI99[0.872-0.915]

OR's controlled for various factors (not reported)