Validation of a risk prediction tool for coronary heart disease in middle-aged women

BMC Women's Health

Table 3 Discriminatory accuracy for models with Your Disease Risk (YDR) relative risk category among 55,802 Nurses’ Health Study participants, 1994–2004, overall and stratified by age in 1994

	N	No. cases	YDR relative risk category model:^a
C–statistic (95 % CI):			0.62 (0.60–0.63)
Age–adjusted c–statistic (95 % CI):			0.71 (0.69–0.72)
Age–specific c–statistic (95 % CI):
≤55:	14,918	124	0.71 (0.69–0.74)
56–60:	12,469	160	0.66 (0.65–0.68)
61–65:	11,350	244	0.62 (0.61–0.64)
66–70:	11,222	386	0.62 (0.61–0.64)
>70:	5843	251	0.59 (0.58–0.61)

RR relative risk, C-statistic concordance statistic, CI confidence interval
^aYDR relative risk category model contains indicator variables representing the YDR risk categories (Very much below average (RR ≤ 0.2), Much below average (0.2 < RR ≤ 0.5), Below average (0.5 < RR ≤ 0.9), About average (0.9 < RR ≤ 1.1), Above average (1.1 < RR ≤ 2.1), Much above average (2.1 < RR ≤ 5.1), Very much above average (RR > 5.1))

ISSN: 1472-6874