Table 1

Selected characteristics of the study population by cases and controls

Cases (n = 393)Controls (n = 406)P
Location of largest adenomaa
 Proximal83 (21.3%)
 Distal245 (63.0%)
 Rectum61 (15.7%)
Number of polypsa
 1186 (47.3%)
 ≥2207 (52.7%)
BsmI polymorphism genotypea
bb144 (36.6%)134 (33.0%)
Bb189 (48.1%)198 (48.8%)
BB60 (15.3%)74 (18.2%)0.402
Sexa
 Men215 (54.7%)208 (51.2%)
 Women178 (45.3%)198 (48.8%)0.325
Age (yr)
 Mean57.98 ± 9.7153.04 ± 10.96
 Range(31–74)(30–74)0.000
Family history of colon cancera
 Yes60 (15.3%)130 (32.0%)
 No333 (84.7%)276 (68.0%)0.001
Smoking historya
 Current79 (20.1%)64 (15.8%)
 Ex179 (45.5%)160 (39.4%)
 Never135 (34.4%)182 (44.8%)0.009
HRTa
 Yes68 (38.4%)101 (51.0%)
 No103 (58.5%)92 (46.5%)0.055
Regular nonsteroidal anti-inflammatory drug usea
 Yes42 (10.7%)68 (16.7%)
 No350 (89.3%)338 (83.3%)0.013
Regular aspirin usea
 Yes106 (27.0%)130 (32.0%)
 No287 (73.0%)276 (68.0%)0.118
BMI
 Mean27.15 ± 4.6526.94 ± 4.60
 Range(14.40–44.90)(17.14–41.54)0.525
Total vitamin D intake (IU)
 Mean321.21 ± 258.04337.59 ± 241.56
 Range(10.71–1826.87)(16.18–1265.28)0.359
Total calcium intake (mg)
 Mean966.18 ± 546.51992.95 ± 536.64
 Range(148.29–2695.29)(211.62–3575.87)0.490
  • a No. of cases.