Table 2.
Poisson regression model fit and tests on model terms
| Model fit | Male subjects |
Female subjects |
||||
|---|---|---|---|---|---|---|
| Akaike information criterion | Lack-of-fit P value | Akaike information criterion | Lack-of-fit P value | |||
| Model 1: age | 616.6 | <0.0001 | 521.8 | <0.0001 | ||
| Model 2: age + drift | 495.3 | <0.0001 | 412.0 | <0.0001 | ||
| Model 3: age + period | 482.6 | <0.0001 | 402.7 | <0.0001 | ||
| Model 4: age + cohort | 326.2 | 0.07 | 312.2 | 0.06 | ||
| Model 5: age + cohort + period | 329.1 | 0.05 | 313.1 | 0.09 | ||
| Test on model terms* | Likelihood ratio test | Likelihood ratio test | ||||
| χ2 | df | P value | χ2 | df | P value | |
| Drift | age (2 vs. 1) | 123.3 | 1 | <0.0001 | 111.8 | 1 | <0.0001 |
| Period | age, drift (3 vs. 2) | 18.7 | 3 | 0.0003 | 15.3 | 3 | 0.002 |
| Cohort | age, drift (4 vs. 2) | 187.1 | 9 | <0.0001 | 117.8 | 9 | <0.0001 |
| Period | age, cohort (5 vs. 4) | 3.1 | 3 | 0.37 | 5.2 | 3 | 0.16 |
| Cohort | age, period (5 vs. 3) | 171.5 | 9 | <0.0001 | 107.7 | 9 | <0.0001 |
df, degrees of freedom.
*A | B denotes A added to a model containing B.