Table 1.

Age-adjusted mortality rate ratio and relative index of inequality for breast cancer mortality according to 5 year calendar periods

	Rate ratio			RII
	None/Primary	Secondary	Tertiary
1983-1987	0.66 (0.54-0.82)	0.67 (0.54-0.82)	1 (reference)	0.84 (0.68-1.03)
1988-1992	0.60 (0.51-0.70)	0.63 (0.54-0.73)	1 (reference)	0.72 (0.60-0.85)
1993-1997	0.96 (0.84-1.10)	1.03 (0.91-1.16)	1 (reference)	0.92 (0.80-1.07)
1998-2002	0.86 (0.77-0.96)	0.87 (0.79-0.95)	1 (reference)	0.88 (0.77-1.00)
2003-2007	1.38 (1.25-1.52)	1.05 (0.97-1.13)	1 (reference)	1.45 (1.29-1.63)
2008-2012	1.31 (1.19-1.43)	0.91 (0.86-0.97)	1 (reference)	1.23 (1.10-1.36)
p value for trend				<.0001