Table 2 Distribution of QTc interval in the included population by age and sex
From: Prevalence and risk factors of prolonged corrected QT interval in general Chinese population
Age (year) | Sample size | Mean QTc (ms) | Prevalence of prolonged QTc | Prevalence of prolonged QTc adjusted for sex | |||
|---|---|---|---|---|---|---|---|
Male | Female | Male | Female | Male> 450 | Female> 470 | ||
35–44 | 2699 | 415.4 ± 21.7 | 431.6 ± 23.2 | 149 (12.6) | 502 (33.0) | 80 (6.8) | 62 (4.1) |
45–54 | 3481 | 419.3 ± 23.3 | 434.4 ± 22.1 | 256 (16.7) | 730 (37.5) | 140 (9.1) | 106 (5.4) |
55–64 | 3371 | 424.7 ± 24.6 | 438.6 ± 23.6 | 358 (22.9) | 829 (45.8) | 191 (12.2) | 135 (7.5) |
≥65 | 1658 | 431.8 ± 24.5 | 443.3 ± 24.5 | 280 (33.5) | 439 (53.3) | 180 (21.6) | 92 (11.2) |