Table 4.

Correlation between the measurement methods

Spearman correlations between BIS R0, volume and circumference
	R0 BIS-Volume	R0 BIS-Circumference	Volume-Circumference
Overall	0.73*	0.75*	0.84*
Baseline	0.71*	0.56*	0.67*
D2	0.62*	0.57*	0.63*
D8	0.33 NS	0.39 NS	0.68*

*Significant at P < 0.01; NS non-significant.

Legends = BIS R0: Bioimpedance spectroscopy; D2: two days after total knee arthroplasty; D8: eight days after total knee arthroplasty.