Table 2

Significance and effect size of factors on bias, false positive (FP) likelihood and false negative (FN) likelihood

Factors	Bias		FP likelihood		FN likelihood
Factors	P value	Coefficient	P value	OR	P value	OR
Gender	0.735	−0.076 (−0.514 to 0.363)	0.579	0.863 (0.512 to 1.453)	0.938	1.055 (0.272 to 4.098)
Age	0.017	−0.016 (−0.029 to −0.003)	0.261	1.010 (0.992 to 1.029)	0.062	1.038 (0.998 to 1.080)
Smoking status	0.089	0.528 (−0.081 to 1.136)	0.933	1.032 (0.496 to 2.146)	0.007	0.121 (0.026 to 0.560)
PAD status	0.672	−0.121 (−0.680 to 0.439)	0.736	1.115 (0.593 to 2.098)	0.080	7.872 (0.779 to 79.58)
FSP	<0.001	−0.455 (−0.639 to −0.279)	0.071	1.263 (0.980 to 1.628)	0.006	0.344 (0.161 to 0.735)
Device model	<0.001	0.309 (0.167 to 0.451)	0.013	0.801 (0.672 to 0.953)	0.014	1.511 (1.087 to 2.100)
Ref. s_pO₂	<0.001	−0.155 (−0.209 to −0.100)	<0.001	0.694 (0.613 to 0.785)	<0.001	2.415 (1.604 to 3.636)

Bias results are from multiple regression analysis. FP and FN likelihood results are from binary logistic regression analysis. Significant p values are shown in bold. 95% CIs are shown in parentheses after coefficient and OR values.
FSP, Fitzpatrick Skin Pigmentation; PAD, peripheral arterial disease; spO2, oxygen saturation.