Baseline characteristics of the study cohort
| High-pitch (n=44) | Standard-pitch (n=51) | p Value | |
| Male, n (%) | 24 (55) | 26 (51) | 0.837 |
| Age, median (IQR) years | 83.5 (75.5–85.0) | 81.0 (71.0–86.0) | 0.261 |
| Weight (mean±SD), kg | 73.5±15.5 | 71.5±13.0 | 0.532 |
| Heart rate, median (IQR), per minute | 70.5 (61.0–80.0) | 69.0 (63.0–79.0) | 0.925 |