Figure 3. Conversion from mild cognitive impairment (MCI) to dementia according to the telomere length (TL) quartile groups in MCI A+. Normalized cumulative conversion data are based on Cox proportional hazards regression analysis adjusted for age as a covariate. The lowest TL quartile group (TL ≤ 6.61 kb) had a significantly greater probability of progressing to dementia compared with the highest TL quartile group (TL > 7.85 kb) in the MCI A+ participants (hazard ratio = 13.16, 95% confidence interval = 1.11 ~ 156.61, P = 0.041).