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Summary of hazard ratios and confidence intervals of risk factors. The summary includes the following survival models: Model 1 (time-to-first-event model, single event type); Model 2 (recurrent event model); Model 3 (multivariate event-type model); Model 4 (multivariate recurrent event model). Circles represent hazard ratios. Confidence intervals for Model 4 are shown as thicker lines.
