Table 2.

Results from statistical analysis of study data. 0-Ctrl, control group; 1-Exp, experimental group; D-CorrLoc, difference in correct tip localization; D-ConfLoc, difference in confidence of tip localization; D-SafePos, difference in correctly categorizing the catheter as well positioned versus malpositioned; $\mathrm{\Delta }$ mean, difference in mean value between pre-/postintervention; and $X$’th %ile, the $X$’th percentile (upper and lower bounds of the 95% confidence interval) in $\mathrm{\Delta }$ mean, $P$-value is estimated using the Wilcoxon signed-rank test.

Measure	$\mathrm{\Delta }$ Mean	2.5th %ile	97.5th %ile	$P$-value
D-CorrLoc
0 – Ctrl	0.0278	$-0.0222$	0.0833	0.5000
1 – Exp	0.0667	0.0056	0.1333	0.1875
D-ConfLoc
0 – Ctrl	$-0.0500$	$-0.2500$	0.1333	0.9453
1 – Exp	0.2167	$-0.0306$	0.4667	0.2422
D-SafePos
0 – Ctrl	0.0222	$-0.0389$	0.0778	0.4453
1 – Exp	0.1000	0.0444	0.1556	0.0313