Figure 3
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1471-2288-11-99/MediaObjects/12874_2010_Article_609_Fig3_HTML.jpg)
Simulated Hazard Ratios under Marginal Model. Large difference is observed for the hazards associated with smoking when fitting without sample weights, if the model does not include the interaction with professional category.
Simulated Hazard Ratios under Marginal Model. Large difference is observed for the hazards associated with smoking when fitting without sample weights, if the model does not include the interaction with professional category.