From: Influence of family size and birth order on risk of cancer: a population-based study
 | All | All | ||||
---|---|---|---|---|---|---|
 |  | Birth order * | Ref |  | Family size ** | Ref |
Cancer site | N | RR (95% CI) | N | N | RR (95% CI) | N |
Thyroid gland | Â | Â | Â | Â | Â | Â |
   papillary | 397 | 0.81 (0.72-0.92) | 442 | 736 | 0.93 (0.77-1.12) | 103 |
   follicular | 58 | 0.70 (0.52-0.94) | 82 | 116 | 0.76 (0.50-1.17) | 24 |
   medullary | 20 | 0.81 (0.50-1.32) | 23 | 37 | 0.92 (0.49-1.74) | 6 |
   other | 31 | 0.85 (0.59-1.24) | 45 | 64 | 1.17 (0.69-1.98) | 12 |