Table 1.
Characteristics of colorectal cancer cases and controls
| Characteristics a | Cases (N=8,290) | Controls (N=9,115) | P c |
|---|---|---|---|
| Female (N)† | 4619 | 5053 | -- |
|
| |||
| Male (N) † | 3671 | 4062 | 0.71 |
|
| |||
| Age (years) | 64.0 (10.2) | 64.4 (9.4) | 0.004 |
|
| |||
| BMI (kg/m2) | 27.3 (4.9) | 26.5 (4.5) | <0.0001 |
|
| |||
| Ever smoked (%) | 57.5 | 53.9 | <0.0001 |
|
| |||
| Aspirin use (%)b | 23.0 | 29.8 | <0.0001 |
|
| |||
| Non-aspirin NSAID use (%)b | 13.4 | 16.9 | <0.0001 |
|
| |||
| Total calcium (mg/day) | 703.5 (636.6) | 831.5 (703.3) | <0.0001 |
|
| |||
| Total folate (DFEs) | 440.9 (374.4) | 490.3 (376.2) | <0.0001 |
|
| |||
| Fruit (servings/day) | 1.7 (1.4) | 1.9 (1.5) | <0.0001 |
|
| |||
| Vegetable (servings/day) | 2.2 (1.8) | 2.5 (1.9) | <0.0001 |
| Red neat (servings/day) | 0.78 (0.61) | 0.73 (0.60) | <0.0001 |
| Processed meat (servings/day) | 0.45 (0.45) | 0.37 (0.41) | <0.0001 |
Abbreviations: BMI, body mass index; NSAID, non-steroidal anti-inflammatory drug; DFEs, dietary folate equivalents
a
Values are mean (SD) or percentages
b
Use at referent time
c
P values calculated using t-tests for continuous variables or χ2 tests for dichotomous variables
†
Cases and controls were matched on age and gender