Cleveland Family Study

/datasets/cfs/variables/qrsduran /datasets/cfs/variables/qtc

Q-T interval

Units milliseconds
Type numeric

Visit vs Q-T interval

N Mean StdDev Median Min Max Unknown Total
Visit 5 733 401.3 ± 34.3 400.0 328.0 632.0 2 735

Age at time of visit vs Q-T interval

Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 656 402.3 ± 34.9 400.0 328.0 632.0 2 658
5-14 yrs old 63 385.2 ± 42.7 376.0 336.0 632.0 1 64
15-24 yrs old 112 392.3 ± 29.1 388.0 328.0 488.0 - 112
25-34 yrs old 62 394.6 ± 24.9 392.0 352.0 480.0 - 62
35-44 years 98 402.7 ± 32.5 400.0 332.0 504.0 - 98
45-54 years 147 405.1 ± 29.9 400.0 352.0 484.0 1 148
55-64 years 84 411.4 ± 37.4 408.0 348.0 596.0 - 84
65-74 years 57 410.5 ± 33.4 412.0 332.0 488.0 - 57
75-84 years 31 433.8 ± 46.3 432.0 352.0 600.0 - 31
85 years or older 2 402.0 ± 2.8 402.0 400.0 404.0 - 2

Sex vs Q-T interval

Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 733 401.3 ± 34.3 400.0 328.0 632.0 2 735
Female 404 400.9 ± 36.2 396.0 328.0 632.0 2 406
Male 329 401.8 ± 31.9 400.0 332.0 488.0 - 329

Race vs Q-T interval

Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 733 401.3 ± 34.3 400.0 328.0 632.0 2 735
White 304 406.8 ± 32.7 404.0 328.0 596.0 - 304
Black 407 397.3 ± 35.1 392.0 332.0 632.0 2 409
Other 22 399.8 ± 33.8 400.0 340.0 468.0 - 22