Table 1.
Participant characteristics by study and case-control status*
| Study | Case-control status | Number of participants | Mean (SD) age at recruitment, y | Mean (SD) BMI, kg/m2 | Married or cohabiting, % | Higher education, % | Current smokers, % | Mean (SD) intake of alcohol, g/d |
|---|---|---|---|---|---|---|---|---|
| CARET | Case patients | 666 | 60.0 (5.7) | 28.2 (4.3) | 81.7 | 28.1 | 51.7 | 17.6 (25.3) |
| Control patients | 1282 | 59.7 (5.8) | 28.2 (4.4) | 81.7 | 23.9 | 52.3 | 15.6 (26.0) | |
| EPIC | Case patients | 964 | 59.9 (5.8) | 26.6 (3.4) | 88.8 | 27.0 | 24.4 | 21.6 (24.8) |
| Control patients | 1063 | 59.6 (5.7) | 26.9 (3.6) | 88.8 | 22.7 | 29.9 | 21.2 (24.4) | |
| MCCS | Case patients | 549 | 60.9 (6.4) | 27.2 (3.5) | 80.2 | 22.6 | 9.7 | 19.1 (24.4) |
| Control patients | 1019 | 58.4 (7.2) | 27.2 (3.7) | 81.2 | 22.5 | 13.2 | 21.1 (25.8) | |
| MEC | Case patients | 377 | 68.6 (7.1) | 26.6 (4.1) | 76.9 | 32.2 | 15.0 | 23.4 (42.8) |
| Control patients | 732 | 68.5 (7.2) | 27.0 (4.2) | 78.8 | 31.1 | 12.1 | 21.8 (38.6) | |
| PCPT | Case patients | 995 | 63.3 (5.5) | 27.4 (4.1) | 87.5 | 39.4 | 6.7 | 9.7 (16.1) |
| Control patients | 995 | 63.3 (5.5) | 27.6 (4.0) | 87.7 | 37.1 | 7.5 | 9.0 (13.9) | |
| PHS | Case patients | 488 | 58.2 (7.8) | 24.7 (2.5) | N/A | 100.0 | 7.6 | 7.3 (6.1) |
| Control patients | 499 | 58.1 (7.6) | 24.4 (2.5) | N/A | 100.0 | 7.4 | 7.0 (6.1) | |
| SELECT | Case patients | 1059 | 63.8 (6.1) | 28.6 (4.4) | 83.5 | 56.0 | 5.1 | 9.2 (15.3) |
| Control patients | 1059 | 63.9 (6.6) | 28.7 (4.7) | 83.2 | 52.1 | 7.4 | 9.1 (15.0) |
* The numbers of case patients and control patients are the maximum numbers for whom fatty acid measurements were available, and numbers varied by fatty acid. BMI = body mass index; CARET = Carotene and Retinol Efficacy Trial; EPIC = European Prospective Investigation into Cancer and Nutrition; MCCS = Melbourne Collaborative Cohort Study; MEC = Multiethnic Cohort; N/A = data not available for this study; PCPT = Prostate Cancer Prevention Trial; PHS = Physicians’ Health Study; SELECT Selenium and Vitamin E Cancer Prevention Trial.