Table 1.

Values of the NRI using various cut points^* comparing models with and without systolic blood pressure.

	All			Cases			Non-cases
	NRI	95% CI	p	NRI	95% CI	P	NRI	95% CI	p
NRI>0	0.382	0.299 to 0.465	<0.0001	0.159	0.077 to 0.241	0.0001	0.223	0.210 to 0.235	<0.0001
4-Category	0.078	0.035 to 0.121	0.0004	0.084	0.041 to 0.127	0.0001	−0.006	−0.011 to −0.002	0.0019
3-Category	0.061	0.024 to 0.098	0.0013	0.066	0.029 to 0.103	0.0004	−0.006	−0.009 to −0.002	0.0027
2-Category	0.044	0.014 to 0.074	0.0036	0.048	0.019 to 0.078	0.0014	−0.004	−0.007 to −0.002	0.0010
NRI(p)	0.005	−0.020 to 0.030	0.69	−0.007	−0.031 to 0.017	0.56	0.012	0.008 to 0.016	<0.0001

^*Cut points for 8-year risk are 0.04, 0.06, and 0.08 for the 4-category NRI (corresponding to 10-year risk of 0.05, 0.075, and 0.10); 0.04 and 0.08 for the 3-category NRI; and 0.06 for the 2-category NRI. The observed 8-year incidence in the sample (p) is 0.023.