|  |  | SDNN | rMSSD | LF | HF | LF:HF | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |  |  | low | normal | low | normal | low | normal | low | normal | low | normal | ||||||||||
 |  | n | % | n | % | n | % | n | % | n | % | n | % | n | % | n | % | n | % | n | % | |
Age (years) | OPA | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | |
 | < 45 | Low | 16 | 20.3 | 63 | 79.8 | 5 | 6.3 | 74 | 93.7 | 18 | 22.8 | 61 | 77.2 | 8 | 10.1 | 71 | 89.9 | 23 | 29.1 | 56 | 70.9 |
 |  | High | 8 | 23.5 | 26 | 76.5 | 2 | 5.9 | 32 | 94.1 | 11 | 32.4 | 23 | 67.7 | 4 | 11.8 | 30 | 88.2 | 12 | 35.3 | 22 | 64.7 |
 |  | p-value | 0.3481 | 0.464 | 0.1428 | 0.3977 | 0.2573 | |||||||||||||||
 | ≥45 | Low | 4 | 30.8 | 9 | 69.2 | 0 | 0.0 | 13 | 100.0 | 5 | 38.5 | 8 | 61.5 | 1 | 7.7 | 12 | 92.3 | 9 | 69.2 | 4 | 30.8 |
 |  | High | 4 | 80.0 | 1 | 20.0 | 3 | 60.0 | 2 | 40.0 | 4 | 80.0 | 1 | 20.0 | 3 | 60.0 | 2 | 40.0 | 1 | 20.0 | 4 | 80.0 |
 |  | p-value | 0.0299 | 0.0011 | 0.0572 | 0.0084 | 0.0299 | |||||||||||||||
Exercise (times/ week) | ||||||||||||||||||||||
 | ≥ 3 | Low | 6 | 24.0 | 19 | 76.0 | 0 | 0.0 | 25 | 100.0 | 8 | 32.0 | 17 | 68.0 | 2 | 8.0 | 23 | 92.0 | 10 | 40.0 | 15 | 60.0 |
 |  | High | 3 | 25.0 | 9 | 75.0 | 2 | 16.7 | 10 | 83.3 | 4 | 33.3 | 8 | 66.7 | 2 | 16.7 | 10 | 83.3 | 6 | 50.0 | 6 | 50.0 |
 |  | p-value | 0.4735 | 0.0179 | 0.4677 | 0.2134 | 0.2827 | |||||||||||||||
 | 1–2 | Low | 9 | 20.9 | 34 | 79.1 | 3 | 7.0 | 40 | 93.0 | 11 | 25.6 | 32 | 74.4 | 5 | 11.6 | 38 | 88.4 | 15 | 34.9 | 28 | 65.1 |
 |  | High | 5 | 29.4 | 12 | 70.6 | 1 | 5.9 | 16 | 94.1 | 5 | 29.4 | 12 | 70.6 | 1 | 5.9 | 16 | 94.1 | 6 | 35.3 | 11 | 64.7 |
 |  | p-value | 0.2420 | 0.4391 | 0.3812 | 0.2519 | 0.4880 | |||||||||||||||
 | 0 | Low | 4 | 25.0 | 12 | 75.0 | 2 | 12.5 | 14 | 87.5 | 4 | 25.0 | 12 | 75.0 | 1 | 6.3 | 15 | 93.8 | 6 | 37.5 | 10 | 62.5 |
 |  | High | 2 | 33.3 | 4 | 66.7 | 2 | 33.3 | 4 | 66.7 | 4 | 66.7 | 2 | 33.3 | 3 | 50.0 | 3 | 50.0 | 0 | 0.0 | 6 | 100.0 |
 |  | p-value | 0.3479 | 0.1296 | 0.0352 | 0.0089 | 0.0393 |