Table 3.

RRs of Hodgkin's lymphoma for number of older siblings in strata of age

Age at diagnosis (Years)No. older siblings
None*
1 or 2
3 or 4
≥5
CasesRRCasesRR (95% CI)CasesRR (95% CI)CasesRR (95% CI)PtrendTotal
≤151381.001280.79 (0.47-1.32)190.76 (0.22-2.58)30.62 (0.07-5.33)0.426288
16-391,0651.001,0550.97 (0.83-1.04)1180.69 (0.53-0.90)120.35 (0.19-0.64)0.0082,250
≥403231.002150.86 (0.66-1.11)330.69 (0.38-1.24)60.57 (0.21-1.58)0.152577
  • NOTE: RR and 95% CI are adjusted for age, sex, total number of siblings, number of younger siblings, residential area, birth cohort, parity, age at first birth, family history of cancer, and socioeconomic index.

  • * Reference category.