Table 1.

Test–retest reproducibility for dermal blood flow response by site

		Arm-to-arm reproducibility		Period-to-period reproducibility
Site	Time, min	P-value*	CCC	P-value	CCC
1	10	< 0.001	0.269	0.0005	0.190
	20	0.0360	0.766	0.7684	0.697
	30	0.2117	0.804	0.8034	0.780
	45	0.4483	0.790	0.7481	0.859
	60	0.9618	0.760	0.4384	0.715
2	10	0.0692	0.355	0.0244	0.215
	20	0.2384	0.951	0.0009	0.836
	30	0.2479	0.887	0.1039	0.714
	45	0.4876	0.932	0.4859	0.376
	60	0.1515	0.797	0.0431	0.344
3	10	0.4623	0.163	0.4421	0.423
	20	0.0025	0.325	0.0006	0.163
	30	0.1137	0.513	0.3259	0.117
	45	0.0552	0.372	0.5679	0.408
	60	0.1548	0.490	0.1614	0.245
4	10	0.0448	0.236	0.1160	0.050
	20	0.0056	0.073	0.0001	0.367
	30	0.0028	0.623	0.0220	0.644
	45	0.0048	0.808	0.8164	0.720
	60	0.4062	0.951	0.3193	0.788

Number of subjects = 12, number of observations = 48. The proximal ring (i.e. closest to the antecubital crease) is referred to as site 1, the distal ring (i.e. closest to the wrist crease) as site 4.

^*Based on Bradley–Blackwood test: P < 0.05 indicates evidence of unequal means or unequal variances from right arm to left arm or from period 1 to period 2. CCC, Concordance correlation coefficient indicating strength of agreement; CCC > 0.9, almost perfect; CCC 0.8–0.9, substantial; CCC 0.65–0.8, moderate; CCC < 0.65, poor.