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Table 3 Improvement in CVD risk prediction due to including age at quitting among past smokers in Model 3

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

Likelihood ratio

Value

Degrees of freedom

p-value

   Vs model 3

25.8845

2

<0.0001

Difference between two correlated C

Estimate (SE)

95% CI

Chi-square

p-value

   Vs model 3

0.0079(0.0036)

0.0008,0.0150

4.7266

0.0297

 

Estimate

95% CI

Z

p-value

NRI

   Vs model 3

0.0294

-0.0111,0.0701

1.4192

0.1558

IDI

   Vs model 3

0.0029

0.0001, 0.0057

2.0362

0.0417

  1. Note: Model 3 incorporated smoking status that included categories for never smokers (reference group), ≤5 and >5 years for time since quitting, and <20, 20-39 and 40+ for pack-years, systolic and diastolic blood pressure, total cholesterol/HDL ratio, triglycerides, age, sex and diabetes status.