Figure 2. Increased senescent cell burden in frailty across the ages. (A) p16INK4a expression was stratified by fit and frail status in all groups (BC and HCT) and by (B) age (≤59 versus ≥60 years old). Expression was normalized to 18S. Values represent the median with 95% confidence interval. Students unpaired two-tailed t test. * p<0.05, ** p<0.01.