Evaluation of a handheld creatinine measurement device for real-time determination of serum creatinine in radiology departments

Table 1 Means, standard deviations, calculated difference between the measured serum creatinine level (mg/dL) using StatSensor™ creatinine and the laboratory reference, Pearson's correlation coefficients, paired t-test and Maloney-Rastogi test, subdivided by study centre, pre- and post-offset correction

			Centre 1	Centre 2	Mean (centre 1 +2)	Pearson correlation coefficient	P value (paired t-test)	P value (Maloney-Rastogi-test)
StatSensor™
cSCr	Pre offset	Device A	0.80 ± 0.34	0.89 ± 0.27	0.85 ± 0.31	Inter-device evaluation (Device A vs B)
		Device B	0.81 ± 0.34	0.89 ± 0.26	0.85 ± 0.30	Center 1 = 0.97	Center 1 = 0.404	Center 1 = 0.480
		Difference between Device A vs B	-0.01 ± 0.09	0.00 ± 0.09		Center 2 = 0.95	Center 2 = 0.689	Center 2 = 0.521
		Mean (Device A + B)	0.80 ± 0.34	0.89 ± 0.26	0.85 ± 0.31
	Post offset	Device A	0.97 ± 0.50
		Device B	0.96 ± 0.50
Laboratory reference
vSCr			0.96 ± 0.42	1.02 ± 0.26	0.99 ± 0.35	Inter-method evaluation (cSCr vs vSCr)
Difference
cSCr - vSCr	Pre offset	Mean (Device A + B)	-0.16 ± 0.16a	-0.14 ± 0.15b	-0.15 ± 0.15c		< 0.0001a,b,c	< 0.0001a,c; 0.9962b
		Device A	-0.16 ± 0.16			0.93	< 0.0001	< 0.0001
		Device B	-0.15 ± 0.17			0.92	< 0.0001	< 0.0001
	Post offset	Device A	0.01 ± 0.19			0.93	0.638	< 0.0001
		Device B	0.00 ± 0.20			0.92	0.955	< 0.0001

cSCr: Capillary serum creatinine; vSCr: Venous serum creatinine.