Table 5.

Univariate analysis of variable correlation on whole-body BIS measures

BIS variable	Covariate	Co-efficient	Confidence intervals		p value
			Lower	Upper
R0 (ohms)	Time (minutes)	− 0.40	− 0.54	− 0.27	< 0.01*
	% TBSA	− 5.09	− 7.08	− 3.10	< 0.01*
	Net fluid shift (ml)	− 0.05	− 0.07	− 0.02	< 0.01*
	Initial TBF (L)	− 5.78	− 8.95	− 2.61	< 0.01*
Ri (ohms)	Time (minutes)	− 2.51	− 3.09	− 1.92	< 0.01*
	% TBSA	− 8.85	− 16.98	− 0.74	0.03*
	Net fluid shift (ml)	− 0.25	− 0.36	− 0.15	< 0.01*
	Initial TBF (L)	− 28.79	− 41.74	− 15.84	< 0.01*
Rinf (ohms)	Time (minutes)	− 0.40	− 0.51	− 0.28	< 0.01*
	% TBSA	− 3.25	− 4.69	− 1.81	< 0.01*
	Net fluid shift (ml)	− 0.05	− 0.07	− 0.03	< 0.01*
	Initial TBF (L)	− 5.38	− 7.68	− 3.07	< 0.01*
ECF (L)	Time (minutes)	0.02	− 0.01	0.05	0.15
	% TBSA	1.40	0.99	1.80	< 0.01*
	Net fluid shift (ml)	0.01	− 0.001	0.01	0.09
	Initial TBF (L)	1.20	0.56	1.85	< 0.01*
ICF (L)	Time (minutes)	0.06	0.03	0.10	< 0.01*
	% TBSA	1.52	1.17	1.88	< 0.01*
	Net fluid shift (ml)	0.01	0.01	0.02	< 0.01*
	Initial TBF (L)	1.56	0.99	2.13	< 0.01*
TBF (L)	Time (minutes)	0.08	0.02	0.14	< 0.01*
	% TBSA	2.92	2.18	3.65	< 0.01*
	Net fluid shift (ml)	0.02	0.01	0.03	< 0.01*
	Initial TBF (L)	2.77	1.59	3.94	< 0.01*

R₀ resistance at zero frequency, R_i intracellular resistance, R_inf resistance at infinite frequency, ECF extracellular fluid, ICF intracellular fluid, TBF total body fluid, TBSA total body surface area, BIS bioimpedance spectroscopy

*p ≤ 0.05