Table 4.

RRs of ALL for sibship size in strata of age

AgeSibship size
1*
2
3
≥4
CasesRRCasesRR (95% CI)CasesRR (95% CI)CasesRR (95% CI)PtrendTotal
≤52331.003461.29 (1.07-1.55)3911.56 (1.26-1.93)732.11 (1.62-2.75)0.0011063
6-141221.002540.96 (0.72-1.28)2751.04 (0.74-1.46)570.81 (0.52-1.27)0.640708
≥151511.002101.01 (0.79-1.29)2221.22 (0.90-1.66)790.98 (0.65-1.46)0.661662
  • 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.