Table 3. Analysis of age–period–cohort effects of hepatitis B surface antigen positivity according to birth year in students who had enrolled between 2005 and 2016 from a university in Taiwan.
| Model | Degrees of freedom | Deviance | Likelihood ratio test | Effects | Deviance difference | df difference | P-value (for X2) |
|---|---|---|---|---|---|---|---|
| Age | 15 | 620.3 | 31301.6 | 492.7 | 9 | <0.001 | |
| Period | 16 | 334.8 | 31755.2 | 207.1 | 10 | 0.050 | |
| Cohort | 12 | 415.4 | 31438.3 | 287.7 | 6 | <0.001 | |
| Age + period | 12 | 326.4 | 458.9 | Cohort | 198.7 | 6 | <0.001 |
| Age + cohort | 8 | 347.3 | 275.5 | Period | 219.6 | 2 | <0.001 |
| Period + cohort | 9 | 320.3 | 323.6 | Age | 192.6 | 3 | <0.001 |
| Age + period + cohort | 6 | 127.7 | 255.8 | Reference | Reference |
Notes.
Abbreviation
- df
- degrees of freedom