Table 2 Nomogram of normal QT interval (ms) obtained from 422 healthy subjects by sex and age group.
| Heart rate (beats/min) | Men | Women | ||
|---|---|---|---|---|
| <50 years | ⩾50 years | <50 years | ⩾50 years | |
| 46–50 | 429 (22) | 440 (25)** | 445 (24)** | 461 (27)† ‡‡‡ |
| 51–55 | 414 (21) | 427 (23)*** | 432 (21)*** | 447 (24)††† ‡‡‡ |
| 56–60 | 402 (20) | 413 (22)*** | 420 (21)*** | 432 (24)††† ‡‡‡ |
| 61–65 | 391 (19) | 402 (21)*** | 405 (19)*** | 419 (21)††† ‡‡‡ |
| 66–70 | 380 (19) | 392 (20)*** | 392 (17)*** | 406 (19)††† ‡‡‡ |
| 71–75 | 372 (19) | 384 (19)*** | 382 (17)*** | 397 (18)††† ‡‡‡ |
| 76–80 | 365 (19) | 376 (19)*** | 374 (17)*** | 389 (18)††† ‡‡‡ |
| 81–85 | 360 (19) | 370 (19)*** | 368 (18)** | 383 (20)††† ‡‡‡ |
| 86–90 | 356 (20) | 363 (19)** | 364 (19)** | 378 (21)††† ‡‡‡ |
| 91–95 | 353 (20) | 357 (20) | 360 (19)* | 371 (21)††† ‡‡‡ |
| 96–100 | 349 (20) | 352 (20) | 356 (20)* | 365 (23)†† ‡‡‡ |
| 101–105 | 346 (21) | 346 (21) | 351 (20)* | 357 (25)‡‡ |
| 106–110 | 340 (20) | 343 (20) | 348 (22)* | 350 (24) |
| 111–115 | 335 (19) | 338 (20) | 341 (21) | 344 (23) |
| 116–120 | 330 (18) | 334 (22) | 334 (21) | 340 (24) |
Data are mean (SD).
*p<0.05, **p<0.01, ***p<0.001 v men <50 years old; †p<0.05, ††p<0.01, †††p<0.001 v women <50 years old; ‡p<0.05, ‡‡p<0.01, ‡‡‡p<0.001 v men ⩾50 years old.