Table 3. Summary of Univariate Analyses for Precision Data.

Covariate	SD	95% CI	p value
Distance from Camera
150	0.21	0.16 - 0.27
200	0.36	0.27 - 0.44
247	0.34	0.28 - 0.41	<0.01
Marker status
All active	0.19	0.15 - 0.23
Minimum active	0.42	0.37 - 0.47
			<0.01
Patient Tracker distance
20	0.31	0.22 - 0.40
30	0.30	0.23 - 0.36
40	0.31	0.24 - 0.38
			0.97

*t-test used to compare two groups. ANOVA used for more than two groups.