Table 3
Final multivariate logistic model. Deviance values and p values are for sequential tests, adding each variable to a model containing all those above it. Odds ratios <1 are associated with a decreasing probability of survival. Odds ratios for continuous variables are for a difference of 5 units^{*} or 1 unit^{†} as indicated. Age is fitted as a function with two linear parts; there is no effect on the odds of survival until the age of 50, but after this point the odds of survival decrease by a factor of 0.545 for each 5 year increase in age