. 2018 Oct 5;11:2207–2219. doi: 10.2147/JPR.S142582

Table S1.

LDF vs PPGamp comparison of computed pain response indices

	Response index to random pain	Median (IQR)		Wilcoxon signed rank test (P-value)
	Response index to random pain	Pain response index computed using LDF	Pain response index computed using PPGamp	Wilcoxon signed rank test (P-value)
Pain task (N=24)	R	−0.35 (−0.46 to −0.23)	−0.33 (−0.43 to −0.28)	0.559
	Tr (sec)	7 (4.5–10)	7.25 (5.6–9.3)	0.749
	Pr	0.0010 (0.0009–0.0800)	0.0010 (0.0006–0.0608)	0.815

Notes: Twenty-four healthy subjects were analyzed.

Abbreviations: PPGamp, photoplethysmograph amplitude; LDF, laser Doppler flowmetry; R, correlation coefficient; Tr, response time; Pr, response significance P-value.