Sibship size (not including the index subject) among population controls (n=1718) and cases affected by non-Hodgkin's lymphomas (n=1388) or Hodgkin's disease (n=354). Data are age adjusted odds ratios and 95% confidence intervals in parentheses
| Sibship size | Men | Women |
| Non-Hodgkin's lymphomas | ||
| 01-150 | 1.0 | 1.0 |
| 1 | 0.89 (0.60, 1.31) | 1.03 (0.67, 1.59) |
| 2–3 | 0.88 (0.59, 1.32) | 1.02 (0.67, 1.58) |
| 4+ | 0.91 (0.63, 1.31) | 0.94 (0.63, 1.39) |
| Hodgkin's lymphomas | ||
| 01-150 | 1.0 | 1.0 |
| 1 | 0.88 (0.45, 1.71) | 0.97 (0.51, 1.83) |
| 2–3 | 1.45 (0.72, 2.92) | 1.02 (0.53, 1.97) |
| 4+ | 0.89 (0.46, 1.73) | 0.60 (0.31, 1.16) |
↵1-150 Reference category.