Cleveland Family Study

/datasets/cfs/variables/qt /datasets/cfs/variables/rhythm

Q-Tc Interval

Units milliseconds
Type numeric

Visit vs Q-Tc Interval

N Mean StdDev Median Min Max Unknown Total
Visit 5 733 419.2 ± 27.7 414.0 363.0 716.0 2 735

Age at time of visit vs Q-Tc Interval

Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 656 420.0 ± 28.4 414.0 363.0 716.0 2 658
5-14 yrs old 63 423.3 ± 44.3 414.0 385.0 716.0 1 64
15-24 yrs old 112 406.1 ± 16.6 404.0 364.0 451.0 - 112
25-34 yrs old 62 410.2 ± 16.6 408.5 372.0 456.0 - 62
35-44 years 98 419.8 ± 22.6 416.5 374.0 516.0 - 98
45-54 years 147 421.9 ± 21.3 419.0 388.0 512.0 1 148
55-64 years 84 429.2 ± 32.1 422.0 393.0 605.0 - 84
65-74 years 57 423.2 ± 26.4 420.0 363.0 483.0 - 57
75-84 years 31 445.5 ± 45.0 431.0 397.0 610.0 - 31
85 years or older 2 412.0 ± 11.3 412.0 404.0 420.0 - 2

Sex vs Q-Tc Interval

Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 733 419.2 ± 27.7 414.0 363.0 716.0 2 735
Female 404 424.4 ± 29.8 420.0 380.0 716.0 2 406
Male 329 412.9 ± 23.4 409.0 363.0 549.0 - 329

Race vs Q-Tc Interval

Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 733 419.2 ± 27.7 414.0 363.0 716.0 2 735
White 304 419.9 ± 24.0 414.5 372.0 605.0 - 304
Black 407 419.1 ± 30.5 414.0 363.0 716.0 2 409
Other 22 410.5 ± 19.2 404.5 383.0 455.0 - 22