Table 5.

RRs of ALL for number of older siblings in strata of age

No. older siblings
None*
1 or 2
≥3
CasesRRCasesRR (95% CI)CasesRR (95% CI)PtrendTotal
3821.004250.88 (0.78-0.99)520.69 (0.52-0.91)0.0101,043
3211.003471.00 (0.86-1.16)400.96 (0.65-1.43)0.927708
3291.002880.90 (0.75-1.10)451.01 (0.64-1.59)0.475662
  • * Reference category.