Table 2 Adjusted relative risk^a of breast cancer mortality in ever- and never-screened^b New Zealand women, 1999–2011

Variable	Regression estimate (s.e.)	P -value	Relative risk (95% CI)	% Mortality difference (95% CI)
Screening status
Never screened			1.00	0
Ever screened	−0.9685 (0.1273)	<0.0001	0.38 (0.30–0.49)	−62 (−70 to −51)
Ever screened (adj.)^c	—	—	0.71 (0.62–0.80)	−29 (−38 to −20)
Ever screened (adj.)^d	—	—	0.66 (0.57–0.75)	−34 (−43 to −25)
Ever screened (adj.)^e	—	—	0.66 (0.58–0.76)	−34 (−42 to −24)
Age at death (years)
60–64 (referent)			1.00
45–49	−0.0628 (0.0512)	0.2198	0.94 (0.85–1.04)
50–54	−0.2660 (0.0742)	0.0003	0.77 (0.66–0.89)
55–59	−0.1378 (0.0582)	0.0179	0.87 (0.78–0.98)
65–69	−0.0608 (0.0336)	0.0704	0.94 (0.88–1.01)
70–74	−0.1211 (0.0625)	0.0526	0.89 (0.78–1.00)
75–79	−0.0676 (0.0846)	0.4242	0.93 (0.79–1.10)
80–84	−0.0072 (0.1587)	0.9637	0.99 (0.73–1.36)
85+	0.5230 (0.1082)	<0.0001	1.69 (1.36–2.09)
Ethnicity
Other			1.00
Māori	0.5130 (0.0475)	<0.0001	1.67 (1.52–1.83)
Pacific	0.4668 (0.0606)	<0.0001	1.59 (1.42–1.80)
Intercept	−8.8737 (0.0784)	<0.0001	—	—

Abbreviation: CI=confidence interval.
^aFrom negative binomial regression model adjusted for repeat measures.
^bEver or never screened with BreastScreen Aotearoa.
^cAdjusted for screening selection bias, assuming relative risk in non-screeners to women not offered screening=1.17 and mean screening participation rate of 64% for 2001–2011.
^dAdjusted for screening selection bias, assuming relative risk in non-screeners to women not offered screening=1.17 and recorded screening participation rate of 71% for 2012–2013.
^eAdjusted for screening selection bias, assuming relative risk in non-screeners to women not offered screening=1.17 and target screening participation rate of 70%.

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