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
severe insomania M = 3,05 CI95[ 2,94; 3,16]
- difference DM = -0,77 CI95[-0.93; -0,61]