Table 2.
Statistical Tests of the Proportional Hazards Assumption by Experiment
| Study | N | % Censored* | Variable of Interest | p Value† |
| 1 | 400 | 0.00 | Drug | .149 |
| 2 | 226 | 0.00 | Diet | .148 |
| 3 | 37 | 2.70 | Genotype/sex | .969 |
| 4 | 598 | 0.30 | Diet | .454 |
| 5 | 180 | 0.00 | Exercise | .029 |
| 6 | 1,843 | 0.00 | Drug | .379 |
| 7 | 547 | 0.00 | Weight | .418 |
| 8 | 219 | 5.90 | Genotype/hormone | .006 |
| 9 | 499 | 21.20 | Diet | .178 |
| 10 | 133 | 0.00 | Genotype | .378 |
| 11 | 99 | 0.00 | Genotype | .956 |
| 12 | 237 | 0.00 | Diet | .294 |
| 13 | 151 | 0.00 | Diet | .660 |
| 14 | 137 | 5.10 | Diet | .497 |
| 15 | 161 | 0.00 | Diet/surgery | .934 |
Notes: N = total sample size.
*
Denotes the percentage of right-censored survival times in full-length experiment.
†
p Values obtained by performing an overall F test of time-based effects.