| LSI (n = 49) | Non-LSI (n = 176) | P value |
---|---|---|---|
Heart rate variability time domain analysis | |||
 aRR (mean ± SD) | 704.58 ± 166.48 | 746.76 ± 141.49 | 0.302 |
 sdRR (mean ± SD) | 30.86 ± 31.20 | 34.71 ± 28.55 | 0.982 |
 avHR (median, IQR) | 97.33, 85.59–122.96 | 88.96, 83.47–96.40 | 0.029 |
 sdHR (median, IQR) | 2.03, 1.71–3.32 | 3.08, 1.88–4.53 | 0.899 |
 RMSSD (mean ± SD) | 17.03 ± 26.46 | 35.12 ± 148.41 | 0.278 |
 NN50 (median, IQR) | 0.00, 0.00–2.00 | 0.00, 0.00–13.75 | 0.043 |
 pNN50 (median, IQR) | 0.00, 0.00–0.45 | 0.00, 0.00–3.85 | 0.051 |
 TINN (mean ± SD) | 122.56 ± 93.47 | 150.75 ± 137.51 | 0.399 |
Heart rate variability frequency domain analysis | |||
 VLF (median, IQR) | 58.50, 41.75–218.25 | 243.00, 132.00–396.00 | 0.416 |
 LF ms2 (median, IQR) | 15.50, 3.00–217.00 | 100.00, 60.00–262.00 | 0.072 |
 HF ms2 (median, IQR) | 4.50, 0.75–25.00 | 44.00, 21.00–167.00 | 0.011 |
 LF norm (median, IQR) | 89.05, 67.98–92.90 | 78.00, 50.30–84.00 | 0.128 |
 HF norm (median, IQR) | 10.95, 7.03–31.98 | 21.00, 16.00–49.30 | 0.128 |
 LF/HF (median, IQR) | 8.11, 3.32–13.26 | 4.52, 1.02–5.62 | 0.147 |
 TP (median, IQR) | 76.00, 46.50–504.25 | 454.00, 275.00–713.00 | 0.175 |
Heart rate complexity non-linear analysis | |||
 Poincare plot SD1(mean ± SD) | 12.01 ± 18.76 | 17.49 ± 25.03 | 0.257 |
 Poincare plot SD2 (mean ± SD) | 41.34 ±  40.65 | 43.42 ±  31.65 | 0.545 |
 Approximate entropy (mean ± SD) | 1.00 ± 0.25 | 1.09 ± 0.15 | 0.001 |
 Sample entropy (mean ± SD) | 1.13 ± 0.45 | 1.39 ± 0.38 | 0.144 |
 DFA-α1 (mean ± SD) | 1.24 ± 0.39 | 1.12 ± 0.31 | 0.045 |
 DFA-α2 (median, IQR) | 1.09, 0.93–1.68 | 1.00, 0.89–1.11 | 0.027 |