A Cox proportional hazards model is estimated relating time to psychiatric hospitalization in patients with severe mental illness. The risk factors include age, sex, prior hospitalization for mental illness, and an indicator of bipolar disorder. The parameter estimates and significance levels for the model are shown here. Which of the predictors are statistically significantly associated with time to psychiatric hospitalization? Predictor Parameter Estimate p-value Age, years 0.0045 0.5647 Sex (0 = female, 1 = male) –0.4841 0.0341 Prior hospitalization (0 = no, 1 = yes) 0.3726 0.6178 Bipolar disorder (0 = no, 1 = yes) 0.7561 0.0042   Sex & Bipolar disorder Sex & Age Prior hospitalization & Bipolar disorder None of Above

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