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Table 1 Socio-demographic variables of age, sex and social class for each age group

From: Mood and cognition in healthy older European adults: the Zenith study

  Age groups
Variable 55-70 yrs 70-87 yrs
N 188 199
Mean (SD) age in years 61.8 (4.4) 74.3 (3.7)
Sex (%)   
Male 49.5 51.8
Female 50.5 48.2
Social class (%)   
Professional 43.2 33.2
Skilled 48.1 55.8
Semi-unskilled 8.7 11.1