Table 1 Clinical and HRV characteristics for 5641 patients undergoing non-cardiac surgery
Features | Characteristic | Count (%) | p-value |
|---|---|---|---|
Gender |  |  | < 0.001 |
male | 2877 (51.0) | Â | |
female | 2764 (49.0) | Â | |
Age (years) |  |  | < 0.001 |
0–19 | 96 (1.7) |  | |
20–39 | 684 (12.1) |  | |
40–59 | 2288 (40.6) |  | |
60–79 | 2390 (42.4) |  | |
80 +  | 183 (2.2) |  | |
Anesthesia time (hours) |  |  | < 0.001 |
0–2 | 1656 (29.4) |  | |
3–4 | 2270 (40.2) |  | |
5–6 | 1221 (21.6) |  | |
7 +  | 494 (8.8) |  | |
Average heart rate |  |  | < 0.001 |
0–59 | 552 (9.8) |  | |
60–69 | 1516 (26.9) |  | |
70–79 | 1705 (30.2) |  | |
80–99 | 1469 (26.0) |  | |
100 +  | 399 (7.1) |  | |
Relative FFT LF Power |  |  | < 0.001 |
0–19 | 993 (17.6) |  | |
20–39 | 2964 (52.5) |  | |
40–59 | 1648 (29.2) |  | |
60 +  | 36 (0.6) |  | |
DFA \({\boldsymbol{\alpha }}_{1}\) |  |  | < 0.001 |
0–1 | 383 (6.8) |  | |
1–1.2 | 1728 (30.6) |  | |
1.2–1.4 | 3046 (54.0) |  | |
1.4 +  | 484 (8.6) |  | |
Postoperative ICU stay | Â | Â | / |
No | 4658 (81.0) | Â | |
Yes | 1073 (19.0) | Â | |
In-hospital mortality | Â | Â | / |
No | 5589 (99.1) | Â | |
Yes | 52 (0.9) | Â | |
Total length of hospital stays (days) | Â | Â | / |
0–3 | 1103 (19.6) |  | |
4–6 | 1371 (24.3) |  | |
7–9 | 1412 (25.0) |  | |
10 +  | 1755 (31.1) |  |