Table 2.

Measurements of force required to displace the catheter from the needle in Cannula P and I as an indirect measure of static resistance

	Cannula P	Cannula I	Difference	p-value
22G static resistance; N	1.80 (25.2)	0.39 (28.7)	1.41 [1.09 to 1.73]	2 × 10-6
20G static resistance; N	0.73 (40.0)	0.55 (37.3)	0.19 [-0.04 to 0.41]	0.12
18G static resistance; N	2.40 (37.4)	0.44 (13.3)	1.96 [1.40 to 2.52]	7 × 10-5

Values are mean with (relative standard deviation %) or [95% confidence interval].