- 20-65 aged, general public, The Netherlands, 1968
- N = 1552
- Non Response:
- 34% refusal and unattainable.
- Authors's label
- Recent illness
- Our Classification
- Closed question on number of days one stayed in bed due to illness during the past three months: not a single day / a few days / about 1 week / 2 weeks - 1 month / 1-3 months / 3 months.