Table 3.

Comparison of groups’ mean score before and after the intervention (n=287)

Variables	n	Pretest	Post-test	t	P value	95% CI
		M (SD)	M (SD)			Lower	Upper
Group 1
Mastery score	79	1.20 (0.16)	1.24 (0.11)	1.81	0.08	0.003	0.06
Percentage of correct answers	79	42.03 (9.53)	48.77 (6.57)	5.97	<0.001*	4.49	8.99
Group 2
Mastery score	99	1.67 (0.55)	4.35 (1.73)	14.77	<0.001*	2.31	3.03
Percentage of correct answers	99	54.29 (8.15)	67.78 (5.60)	12.67	<0.001*	11.37	15.59
Group 3
Mastery score	109	1.42 (0.35)	1.76 (0.21)	10.24	<0.001*	0.27	0.41
Percentage of correct answers	109	50.08 (8.07)	57.36 (5.46)	9.54	<0.001*	5.76	8.79

Note. The mastery score was rated on an 8-point scale ranging from 1 (easiest) to 8 (most difficult) in the online adaptive testing system. The percentage of correct answers in the pretest and post-test reflect the number of correct answers in relation to the overall number of questions in the pretest and post-test. Group 1: mastery scores in the exit exam were equivalent to the overall mean mastery score in the pretest. Group 2: mastery scores in the exit exam were equal to or greater than the overall mean mastery score in the exit exam. Group 3: mastery scores fell between those of Groups 1 and 2.