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.