Table 5: Multivariate poisson GEE models* for breast events.

MammogramUS/MRIBiopsyNumber of breast events
CharacteristicIRR95% CI -valueIRR95% CI -valueIRR95% CI -valueIRR95% CI -value

Age group
 65–691.00(—, —)1.00(—, —)1.00(—, —)1.00(—, —)
 70–741.01(0.97, 1.05)0.760.98(0.68, 1.40)0.901.05(0.80, 1.39)0.720.98(0.91, 1.05)0.55
 75–800.98(0.93, 1.02)0.310.65(0.41, 1.02)0.060.66(0.45, 0.96)0.030.90(0.83, 0.97)0.01
 80+0.89(0.83, 0.95) 0.0010.73(0.45, 1.20)0.210.54(0.36, 0.83)0.0050.82(0.75, 0.90) 0.001
Stage at diagnosis
 I1.00(—, —)1.00(—, —)1.00(—, —)1.00(—, —)
 DCIS1.00(0.95, 1.04)0.920.97(0.67, 1.42)0.881.04(0.76, 1.40)0.821.00(0.94, 1.07)0.88
 IIA0.93(0.89, 0.99)0.010.62(0.40, 0.97)0.040.66(0.46, 0.94)0.510.85(0.79, 0.92) 0.001
 IIB0.87(0.79, 0.97)0.010.82(0.44, 1.52)0.521.15(0.76, 1.73)0.510.81(0.71, 0.94)0.01
 III0.86(0.71, 1.01)0.060.62(0.24, 1.61)0.320.73(0.34, 1.59)0.440.65(0.52, 0.81) 0.001
Primary therapy
 Mastectomy1.00(—, —)1.00(—, —)1.00(—, —)1.00(—, —)
 Breast conserving surgery with radiation1.09(1.06, 1.12) 0.0011.11(0.76, 1.64)0.591.12(0.83, 1.51)0.461.22(1.14, 1.30) 0.001
 Breast conserving surgery 1.00(0.94, 1.07)0.901.68(1.06, 2.66)0.030.95(0.59, 1.50)0.821.19(1.08, 1.31) 0.001
 Unknown/Other0.77(0.68, 0.87) 0.0011.07(0.53, 2.18)0.850.63(0.34, 1.16)0.140.81(0.70, 0.94)0.01
Family history
 No1.00(—, —)1.00(—, —)1.00(—, —)1.00(—, —)
 Yes1.02(0.98, 1.06)0.220.88(0.63, 1.23)0.450.97(0.75, 1.27)0.861.03(0.97, 1.09)0.38
 Unknown0.96(0.75, 1.24)0.78NANANA0.78(0.12, 4.92)0.800.81(0.63, 1.03)0.09
Comorbidities
 01.00(—, —)1.00(—, —)1.00(—, —)1.00(—, —)
 10.97(0.93, 1.02)0.240.93(0.65, 1.34)0.721.18(0.88, 1.58)0.270.97(0.90, 1.05)0.48
 2+0.97(0.92, 1.03)0.341.02(0.64, 1.62)0.951.09(0.73, 1.62)0.680.92(0.84, 1.00)0.06
Education
 Less than high school1.00(—, —)1.00(—, —)1.00(—, —)1.00(—, —)
 High school/ged1.04(0.97, 1.11)0.240.87(0.50, 1.52)0.631.03(0.67, 1.61)0.861.06(0.95, 1.17)0.30
 Some college1.00(0.93, 1.07)0.951.02(0.58, 1.82)0.941.10(0.69, 1.74)0.691.00(0.90, 1.12)0.88
 College or post graduate1.02(0.95, 1.10)0.521.01(0.57, 1.80)0.960.97(0.60, 1.55)0.901.03(0.92, 1.15)0.60
 Unknown1.01(0.93, 1.11)0.740.91(0.44, 1.89)0.801.42(0.85, 2.36)0.181.02(0.89, 1.16)0.81

*Adjusted for all characteristics listed in the table and diagnosis year, number of primary or specialty care visits, and proportion of specialty care visits.
IRR: incidence rate ratio; 95% CI: 95% confidence interval.