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Probability of remaining cognitively unimpaired obtained by different survival functions for the TTE model. AD, Alzheimer’s disease; AIC, Akaike’s Information Criterion; CI, confidence interval; MCI, mild cognitive impairment; TTE, time to event. Kaplan-Meier curves: confidence limits are wide for homozygotes due to the small sample size. Non-genotyped subjects were assumed to be non-carriers
