Table 2.

Mean number of correct answers provided for 15 knowledge items

	MeanT 0 (95% CI)	nT0	MeanT1 (95% CI)	nT1	P value	Effect size
Overall sample	10.4 (10.3 to 10.5)	1579	11.0 (10.9 to 11.1)	1527	<0.001	0.29
Professional group
Nurses	10.2 (10.1 to 10.4)	1050	10.9 (10.8 to 11.0)	1084	<0.001	0.35
Physicians	11.1 (11.0 to 11.3)	350	11.4 (11.2 to 11.6)	288	0.047	0.16
Managerial function
With	11.3 (11.1 to 11.5)	232	11.6 (11.4 to 11.9)	193	0.058	0.19
Without	10.3 (10.1 to 10.4)	1187	10.9 (10.8 to 11.0)	1199	<0.001	0.33
Frequency of catheter placement
Frequent user	10.0 (9.8 to 10.1)	690	10.7 (10.6 to 10.9)	618	<0.001	0.40
Infrequent user	10.8 (10.7 to 10.9)	871	11.2 (11.1 to 11.3)	885	<0.001	0.22
Matched identification	10.4 (10.3 to 10.6)	420	11.3 (11.1 to 11.5)	420	<0.001	0.49
Unmatched identification	10.5 (10.3 to 10.6)	1118	11.0 (10.9 to 11.1)	1052	<0.001	0.31

T₀: baseline survey; T₁: follow-up survey.

Frequent user: places a catheter a few times a month or more often; infrequent user: places a catheter a few times a year or less often.