(b).

	Program level				p value
	1 (n = 121)	2 (n = 119)	3 (n = 124)	4 (n = 121)
Preconfidence for CPR	55.0 (30.0–70.0)	50.0 (30.0–80.0)	50.0 (40.0–70.0)	50.0 (30.0–80.0)	0.533†	<0.001‡
Postconfidence for CPR	90.0 (80.0–100.0)	90.0 (80.0–100.0)	90.0 (80.0–100.0)	90.0 (80.0–100.0)	0.177†
Preconfidence for AED	50.0 (15.0–70.0)	50.0 (20.0–70.0)	50.0 (20.0–60.0)	50.0 (30.0–70.0)	0.579†	<0.001‡
Postconfidence for AED	90.0 (70.0–100. 0)	90.0 (80.0–100.0)	90.0 (80.0–100.0)	90.0 (80.0–100.0)	0.167†

^†Program levels were compared using the Kruskal-Wallis method and expressed as median (interquartile range).

^‡Pre- and postconfidence were compared using the Wilcoxon signed rank test (all, p < 0.001).

CPR: cardiopulmonary resuscitation; AED: automated external defibrillator.