Age at quitting smoking as a predictor of risk of cardiovascular disease incidence independent of smoking status, time since quitting and pack-years

Table 2 Improvement in CVD risk prediction due to including age at quitting among past smokers in Model 1

Likelihood ratio	Value	Degrees of freedom		p-value
Vs model 1	11.4732	2		0.0032
Difference between two correlated C	Estimate (SE)	95% CI	Chi-square	p-value
Vs model 1	0.0047(0.0022)	0.0004, 0.0090	4.5340	0.0332
	Estimate	95% CI	Z	p-value
NRI
Vs model 1	0.0512	0.0117, 0.0906	2.5343	0.0113
IDI
Vs model 1	0.0014	-0.0010,0.0037	1.1012	0.2707

Note: Model 1 included current smoking status, systolic and diastolic blood pressure, total cholesterol/HDL ratio, triglycerides, age, sex and diabetes status.

ISSN: 1756-0500