Figure 2.

Comparing the speed of wound healing in the two groups: patients with fast healing speed and patients with slow healing speed. The univariate analysis shows that several heart rate variability parameters are independent predictors between the two groups such as normalized low frequency (nLF), normalized high frequency (nHF), and the ratio of low frequency to high frequency. *Difference is statistically significant (P value < .05). The analysis adjusted for the wound size at the baseline.