Table IV. Results of Wilcoxon signed-rank test showing the difference between the pretest and posttest of knowledge assessments for both treatments.

		Pretest		Posttest		Z (Posttest − Pretest)	p Value	Effect Size, r Value
Groups	n	Mean	SD	Mean	SD
Experimental
Total	22	3.82	2.22	7.23	2.20	−3.56	<0.001	0.537
Nonprocedural	22	2.82	1.79	3.68	1.25	−3.48	0.034	0.525
Procedural	22	1.00	1.35	3.55	1.22	−2.89	<0.001	0.436
Control
Total	25	4.52	2.35	6.76	1.86	−4.06	<0.001	0.574
Nonprocedural	25	2.92	1.71	4.12	1.62	−2.12	0.001	0.300
Procedural	25	1.60	1.38	2.64	1.25	−3.74	0.004	0.529