International Journal of Emergency Medicine

Table 2 Median differences between needle sticks, redirects, and time to dye flash

From: Do echo-enhanced needles improve time to cannulate in a model of short-axis ultrasound-guided vascular access for a group of mostly inexperienced ultrasound users?

	n	Median^a	25th, 75th percentile	p value^b
Stick diff.	69	0.00	0.00, 0.00	0.99
Redir. diff.	69	0.00	-1.00, 0.00	0.35
Time diff.	69	2.06	-9.22, 14.50	0.35

^aMedian of the difference between echo and standard (calculated by echo−standard). Thus, positive numbers correspond to higher echo values and negative values indicate higher standard values
^bp value from Wilcoxon rank sum test, testing the median difference (echo−standard) = 0

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ISSN: 1865-1380

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