Fig. 4.
The probability of having one or more analgesic event(s) for a female patient of age 80 yr having surgery at 8 am. Probabilities of having each consecutive event before time t were calculated as the cumulative distribution function F(t) based on 1,000 simulations with the repeated time-to-event model. The black dashed lines indicate the separation of day and night, where the hazard was reduced according to the model.