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Kaplan-Meier Survival Curves for All-Cause Mortality for Old-Onset Monkeys. All-cause mortality in the old-onset monkeys was analyzed using Cox regression with age of onset, sex, and diet as predictors. The effect of Diet was not significant (p = 0.934) and Sex was the only significant predictor (p =0.003), therefore Kaplan-Meier survival curves for the four (diet-by-sex) groups were plotted to display the results. Open circles represent monkeys that are still alive.
