Table 5.

Dose effect modification: baseline depends on city, NIC status, age ATB, attained age, and reproductive status ATB

PremenarcheBetween menarche and first birthPost–first birth
RR (95% CI)*RR (95% CI)*RR (95% CI)*
ERR model
    ERR/Gy e = 30,a = 70)1.07 (0.22-3.62)1.36 (0.54-2.75)1.53 (0.63-2.90)
    Age ATB−15% (−52 to 51%)
    Attained age−0.78 (−2.4 to 0.88)
EAR model
    EAR/Gy (e = 30,a = 70)7.74 (1.89-21.91)14.3 (6.44-25.37)11.1 (5.13-18.55)
    Age ATB−5% (−69 to −18%)
    Attained age2.76 (1.66-3.87)
  • *95% CI calculated from the profile likelihood for hazard ratios and ERR and EAR per Gy terms and from Wald's method for age at exposure and attained age terms.

  • Age ATB (change/decade) and attained age (power) effects assumed equal for all reproductive status ATB categories.