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Spearman correlations between Δ NRS pain and Δ SDNN.
| Covariate Adjustments | ρ | 95% CI | P |
|---|---|---|---|
| Unadjusted | −0.40 | (−0.72, 0.05) | 0.08 |
| Adjusted for Device Group (i.e., Active vs. Sham) | −0.43 | (−0.72, −0.02) | 0.04 |
NRS, numeric rating scale; SDNN, standard deviation of normal to normal intervals.
