Table 2.

Results of Fisher exact tests for the proportion of successful cannulations and surface punctures.

Parameters	Results for intervention group	Results for control group	Absolute difference	P value
	Successful cannulations
Cannula 1 [95% CI]	10/10 (100%) [0.72; 1]	4/9 (44.4%) [0.19; 0.73]	55.6%	.011
Cannula 2 [95% CI]	8/10 (80%) [0.49; 0.94]	2/9 (22.2%) [0.06; 0.55]	57.8%	.023
Cannula 3 [95% CI]	4/10 (40%) [0.17; 0.69]	0/9 (0%) [0.0; 0.29]	40%	.087
Total [95% CI]	22/30 (73.3%) [0.56; 0.86]	6/27 (22.2%) [0.11; 0.41]	51.1%	<.001
	Surface punctures
Cannula 1 [95% CI]	10/12 (83.3%) [0.55; 0.95]	4/23 (17.4%) [0.07; 0.37]	65.9%	<.001
Cannula 2 [95% CI]	8/13 (61.5%) [0.36; 0.82]	2/23 (8.7%) [0.02; 0.27]	52.8%	.001
Cannula 3 [95% CI]	4/14 (28.6%) [0.12; 0.55]	0/10 (0%) [0.0; 0.28]	28.6%	.114
Total [95% CI]	22/39 (56.4%) [0.41; 0.71]	6/56 (10.7%) [0.05; 0.22]	45.7%	<.001

For “Successful cannulations,” the numerator is the absolute number of successful cannulations and the denominator is the highest possible number. For “Surface punctures,” the numerator indicates the number of surface punctures compared to successful cannulations and the denominator is the total number. Proportions are given in round brackets. 95% confidence intervals from 0 to 1 are given in square brackets. The 1st and 2nd peripheral venous catheter and total are significant for both the proportion of successful cannulations and surface punctures.

CI = confidence interval.