Table 4.

Assessment of linear correlation.

Indicator	TPOa	Apple	Fitbit	Garmin	Withings
PCCb, r (95% CI)	0.99 (0.99-0.99)	0.98 (0.98-0.99)	0.95 (0.93-0.96)	0.96 (0.95-0.96)	0.97 (0.97-0.98)
RSSc	804	1830	5133	4757	3106
P value (C test)	5.7 × 10–317	2.15 × 10–247	2.4 × 10–153	1.26 × 10–177	2.78 × 10–212
Slope	1.01	0.95	0.88	0.89	0.95
Shift	–0.72	3.81	9.49	6.68	3.72
CCCd, rc (95% CI)	0.99 (0.99-0.99)	0.98 (0.98-0.99)	0.94 (0.93-0.95)	0.95 (0.94-0.96)	0.97 (0.97-0.98)

^aTPO: transmissive pulse oximetry.

^bPCC: Pearson correlation coefficient.

^cRSS: residual sum of squares.

^dCCC: Lin concordance coefficient.