Table 1.
Distribution of selected characteristics among cases and controls1
| Cases (n, %) | Controls (n, %) | |
|---|---|---|
| Age in years2 (Mean ± S.D.) | 62.0 ± 13.7 | 63.4 ± 12.3 |
| Years of formal education (Mean ± S.D.) | 3.5 ± 4.2 | 3.8 ± 4.8 |
| Servings of fruit weekly (median, IQR) | 3.9, 6.8 | 7.8, 10.1 |
| Servings of vegetable weekly (median, IQR) | 18.1, 16.0 | 20.6, 20.1 |
| Birthplace | ||
| Singapore/Malaysia | 82 (65.1) | 130 (80.2) |
| China/other | 44 (34.9) | 32 (19.8) |
| Exposure to environmental tobacco smoke at home | ||
| Daily | 46 (36.5) | 72 (44.4) |
| Weekly < daily | 16 (12.7) | 15 (9.3) |
| Less than weekly | 64 (50.8) | 75 (46.3) |
| Histological subtype | ||
| Squamous/small cell carcinoma | 14 (11.9) | |
| Adenocarcinoma | 85 (72.0) | |
| Large cell undifferentiated/Not otherwise specified | 19 (16.1) |
1 All participants are Chinese women, cases and controls frequency-matched for age. A total of 126 cases and 162 controls were eligible, of which 123 and 159, respectively, were successfully genotyped.
2 Refers to age at diagnosis (cases) and age at interview (controls)