Table 2.

Multivariable analysis with mean differences in velocity (m/s) and contraction wave speed for each fluid and technique

	Velocity (m/s)		Velocity of contraction wave speed (m/s)
Parameter	Estimate (95% CI)	p value	Estimate (95% CI)	p value
Technique: UVP
Newtonian fluids	0.043 (− 0.199 to 0.285)	0.722	0.013 (− 0.030 to 0.055)	0.554
Shear thinning fluids	0.092 (− 0.158 to 0.341)	0.462	0.006 (− 0.037 to 0.048)	0.786
Boger fluids	Reference		Reference
Technique: XVF
Newtonian fluid	− 0.036 (− 0.277 to 0.206)	0.768	0.009 (− 0.033 to 0.052)	0.665
Shear thinning fluid	0.119 (− 0.122 to 0.361)	0.325	0.008 (− 0.034 to 0.051)	0.696
Boger fluid	Reference		Reference
Technique: XVF compared to UVP
Newtonian fluid: XVF	− 0.234 (− 0.476 to 0.007)	0.057	− 0.037 (− 0.080 to 0.005)	0.083
UVP	Reference		Reference
Shear thinning fluid: XVF	− 0.128 (− 0.378 to 0.121)	0.306	− 0.031 (− 0.074 to 0.011)	0.143
UVP	Reference		Reference
Boger fluid: XVF	− 0.156 (− 0.397 to 0.086)	0.201	− 0.034 (− 0.076 to 0.009)	0.114
UVP	Reference		Reference

UVP ultrasound velocity profiling, XVF X-ray video-fluoroscopy