Appendix C. Plot of site effects for three different semi-parametric proportional hazards models: age-based time scale, study-based time scale, and recurrent model.
FIG. C1. Site effects (relative risk of mortality for each site relative to site 1) for three different models: age-based time scale (open circle), study-based time scale (open triangle), recurrent model with year effect included (solid triangle), along with 95% confidence intervals. |