Study Hajak (2001): study DE 1997

Public

18+ aged, general public, Germany, 1997

Sample

Respondents

N = 1913

Non Response

Assessment

Interview: face-to-face
interview at subjects home and additional questionnaire

Correlate

Authors's Label

Severe Insomnia

Our Classification

Distribution

N=206: severe sleep complaints; N=162: no sleep complaints (=control group)
-55%: no sleep complaint last month; 4%  severe insomnia

Operationalization

Self report
0: no sleep complaints
1: severe insomnia

Observed Relation with Happiness