Approximate bias in conditional logistic regression estimates of the association between weekly pay code and all cause mortality in a cohort of 8307 white male nuclear industry workers
| Sampling ratio | Method I† | Method II‡ |
|---|---|---|
| (Controls:case) | Bias | Bias |
| Values obtained after 100 replications of nested case-control analyses conducted using two methods for incidence density sampling with 10, 50, and 100 controls per case. | ||
| Note the value reported as bias is the ratio of the average parameter estimate derived via conditional logistic regression (obtained after 100 iterations of the nested case-control analysis) to the parameter estimate derived via Cox proportional hazards regression using data for the full cohort. | ||
| †The incidence density sampling program shown in the Appendix of this paper. | ||
| ‡The incidence density sampling program proposed by Pearce5 with follow up time partitioned in units of person-years. | ||
| 10:1 | 1.00 | 1.01 |
| 50:1 | 1.00 | 1.14 |
| 100:1 | 1.00 | 1.32 |