From: Mood and cognition in healthy older European adults: the Zenith study
 | Age groups | |
---|---|---|
Variable | 55-70Â yrs | 70-87Â yrs |
N | 188 | 199 |
Mean (SD) age in years | 61.8 (4.4) | 74.3 (3.7) |
Sex (%) | Â | Â |
 Male | 49.5 | 51.8 |
 Female | 50.5 | 48.2 |
Social class (%) | Â | Â |
Professional | 43.2 | 33.2 |
 Skilled | 48.1 | 55.8 |
 Semi-unskilled | 8.7 | 11.1 |