Table 1.
Data extracted from case control studies.
| Reference | Country; Study acronym | Cases + Incidence of OC use | Controls + Incidence of OC use | Age (median) | Confounding |
|---|---|---|---|---|---|
| (26) | Switzerland | 131 (14) | 373 (63) | 62 | Age, education, family history of CRC, parity, fiber intake, and physical activity |
| (27) | Wisconsin, USA | 1488 (426) | 4297 (1968) | 47 | Family history of colorectal cancer, physical activity, and hormone replacement therapy |
| (28) | Canada | 1404 (705) | 1203 (680) | 48 | Physical activity, body mass index (BMI) |