Table 1 Baseline characteristics of 45 900 participants (mean and s.d. or number and %) by smoking category in the Singapore Chinese Health Study (1993–2007)
Smoking category | |||||
|---|---|---|---|---|---|
Demographics at baseline recruitment | Total ( n =45 900) | Current smokers ( n =6955) | New quitters ( n =1765) | Continuous ex-smokers ( n =3888) | Never smokers ( n =33 292) |
Men | 18 688 (40.7%) | 5802 (83.4%) | 1495 (84.7%) | 3503 (90.1%) | 7888 (23.7%) |
Age (years) | 55.5 (7.7) | 56.2 (7.5) | 57.7 (7.6) | 59.0 (7.9) | 54.9 (7.5) |
Body mass index | 23.1 (3.3) | 22.4 (3.2) | 22.9 (3.3) | 23.5 (3.4) | 23.3 (3.3) |
Dialect group, Cantonese | 22 219 (48.4%) | 2714 (39.0%) | 719 (40.7%) | 1988 (51.1%) | 16798 (50.5%) |
No formal education | 11 731 (25.6%) | 1467 (21.1%) | 340 (19.3%) | 523 (13.5%) | 9401 (28.2%) |
Alcohol intake, g per day | 1.6 (7.3) | 5.2 (13.5) | 3.1 (10.3) | 3.0 (10.5) | 0.7 (3.6) |
Vegetable intake, g per day | 112.9 (63.3) | 104.4 (61.5) | 105.7 (61.7) | 114.6 (65.7) | 114.9 (63.2) |
Fruit intake, g per day | 207.0 (168.6) | 170.7 (159.7) | 186.1 (155.0) | 219.8 (172.4) | 214.2 (196.6) |
Mean time between two interviews, years | 5.8 (1.5) | 6.0 (1.5) | 6.3 (1.5) | 5.6 (1.5) | 5.7 (1.5) |
