Table 2.

Comparison of students' test scores before and after PDCA quality improvement.

Group	Number of cases	Theory	Operation
Before quality improvement	50	82.7 ± 6	93.7 ± 2.3
Quality improvement	50	89.6 ± 3.7	95.0 ± 1.0
t		-6.89	-3.6
p		<0.05	0.001