Table 2f. Improvement in prediction due to including both intensity and duration of smoking among current smokers in model 6.
| Likelihood ratio | Value | Degrees of freedom | P |
|---|---|---|---|
| Vs. model 1 | 23.5064 | 10 | 0.0090 |
| Vs. model 2 | 18.9495 | 9 | 0.0256 |
| Difference between Two correlated C |
Estimate (SE) | 95% CI | x2 | P |
|---|---|---|---|---|
| Vs. model 1 | 0.0050 (0.0030) | −0.0009, 0.0110 | 2.7338 | 0.0982 |
| 95% CI | 0.0045 (0.0029) | −0.0012, 0.0103 | 2.3760 | 0.1232 |
| Estimate | 95% CI | Z | P | ||
|---|---|---|---|---|---|
| NRI | |||||
| Vs. model 1 | 0.0440 | 0.0120, 0.0761 | 2.6845 | 0.0072 | |
| Vs. model 2 | 0.0268 | 0.0073, 0.0611 | −1.5365 | 0.1244 | |
| IDI | |||||
| Vs. model 1 | 0.0031 | −0.00008, 0.0062 | 1.9101 | 0.0561 | |
| Vs. model 2 | 0.0019 | −0.0013, 0.0052 | 1.1773 | 0.2390 |