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Heart Rate Variability (Absolute Units)a
| HRV Parameter | Mean (SD), μs2 | P Value | |
|---|---|---|---|
| E-Cigarette User (n = 16) | Nonuser Control Participant (n = 18) | ||
| High frequency | 833.6 (295.7) | 1376.5 (574.2) | .33 |
| Low frequency | 455.5 (258.2) | 1316.0 (504.0) | .08 |
| Very low frequency | 896.0 (524.2) | 987.1 (432.5) | .59 |
| Total power | 1652.0 (720.5) | 4502.0 (1279.8) | .04 |
Abbreviation: HRV, heart rate variability.
Median values are displayed because these data followed a nonparametric distribution.
