Categorical variableAge when measuredCategoryN (%)
Smoking53Never384 (49)
Ex239 (30)
Current167 (21)
Childhood SEP53Professional57 (7)
Intermediate160 (21)
Skilled (non-manual)123 (16)
Skilled (manual)245 (31)
Partly skilled148 (19)
Unskilled48 (6)
Adult SEP53Professional14 (2)
Intermediate261 (33)
Skilled (non-manual)286 (36)
Skilled (manual)57 (7)
Partly skilled119 (15)
Unskilled50 (7)
Education53None275 (35)
Vocational44 (5)
Sub-GCE38 (5)
O level201 (26)
A level106 (14)
Burham A275 (10)
Degree32 (4)
Postgraduate2 (1)
  • BMI, body mass index; GCE, General Certificate of Education; SEP, socioeconomic position.