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Demographic characteristics of the study participants
| Characteristic | N beat (n=4228) | S beat (n=68) | VP beat (n=20) | P (S vs N) | P (VP vs N) |
|---|---|---|---|---|---|
| Age (mean±SD), y | 69.2±9.3 | 77.5±8.3 | 76.3±10.5 | <0.0001 | 0.007 |
| Women, n(%) | 2291(54) | 21(31) | 5(25) | <0.0001 | 0.009 |
| White, n(%) | 1681(40) | 39(57) | 8(40) | 0.003 | 0.982 |
| African-American, n(%) | 1121(27) | 12(18) | 5(25) | 0.100 | 0.878 |
| Asian-American, n(%) | 517(12) | 2(3) | 0 | 0.020 | 0.095 |
| Hispanic-American, n(%) | 909(22) | 15(22) | 7(35) | 0.911 | 0.143 |
