Table 2c. Improvement in prediction due to including time since quitting among past smokers in model 4.
| Likelihood ratio | Value | Degrees of freedom | P | |
|---|---|---|---|---|
| Vs. model 1 | 15.9421 | 2 | 0.0003 | |
| Vs. model 2 | 11.3852 | 1 | 0.0007 |
| Difference between Two correlated C |
Estimate (SE) | 95% CI | x2 | P |
|---|---|---|---|---|
| Vs. model 1 | 0.0041 (0.0027) | −0.0011, 0.0094 | 2.3715 | 0.1236 |
| Vs. model 2 | 0.0036 (0.0026) | −0.0014, 0.0087 | 2.0005 | 0.1572 |
| Estimate | 95% CI | Z | P | |
|---|---|---|---|---|
| NRI | ||||
| Vs. model 1 | 0.0394 | 0.0122, 0.0666 | 2.8332 | 0.0046 |
| Vs. model 2 | 0.0222 | −0.0092, 0.0537 | 1.3832 | 0.1666 |
| IDI | ||||
| Vs. model 1 | 0.0020 | −0.0004, 0.0046 | 1.5924 | 0.1112 |
| Vs. model 2 | 0.0009 | −0.0017, 0.0036 | 0.6823 | 0.4950 |