QRS duration distributed by age and gender
| Age (years) | QRS duration (ms) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Male | Female | |||||||||||
| Median | Mean | SD | 98% | 2% | Total | Median | Mean | SD | 98% | 2% | Total | |
| <20 | 98.00 | 99.04 | 12.11 | 116.72 | 82.00 | 67 | 86.00 | 89.69 | 15.17 | 132.16 | 74.00 | 59 |
| 20–29 | 98.00 | 101.48 | 13.52 | 138.00 | 82.00 | 251 | 86.00 | 87.57 | 10.62 | 121.40 | 72.00 | 306 |
| 30–39 | 96.00 | 97.61 | 11.63 | 120.04 | 78.00 | 400 | 86.00 | 86.85 | 9.51 | 109.36 | 72.00 | 567 |
| 40–49 | 96.00 | 97.17 | 12.72 | 134.44 | 78.00 | 640 | 86.00 | 87.04 | 10.06 | 110.76 | 72.00 | 1082 |
| 50–59 | 94.00 | 96.47 | 12.34 | 132.88 | 78.00 | 1429 | 86.00 | 88.03 | 12.04 | 127.18 | 72.00 | 1792 |
| 60–69 | 94.00 | 95.99 | 15.25 | 146.00 | 74.00 | 1247 | 86.00 | 88.39 | 13.88 | 124.00 | 71.80 | 1296 |
| 70–79 | 92.00 | 96.21 | 17.15 | 151.40 | 74.00 | 666 | 84.00 | 87.30 | 13.69 | 164.00 | 68.00 | 760 |
| >79 | 94.00 | 98.54 | 21.37 | 159.68 | 72.08 | 255 | 86.00 | 89.70 | 18.79 | 145.08 | 66.92 | 274 |