Table 3.

Ranks and test statistics for the System Usability Scale (SUS) scores from the second-week and postintervention surveys for the high-potential and low-potential groups (N=11).

Group and rank		n	Rank (postintervention – second week)		Test statisticsa (postintervention – second week)
			Mean rank	Sum of ranks	z value	P value
High-potential group (n=6)					–0.271b	.79
	Negative rankc	2	3.25	6.50
	Positive rankd	3	2.83	8.50
	Tiede	1	N/Af	N/A
Low-potential group (n=5)					1.761b	.08
	Negative rank	1	1.00	1.00
	Positive rank	4	3.50	14.00
	Tied	0	N/A	N/A

^aWilcoxon signed-rank test.

^bBased on negative ranks.

^cPostintervention score<score at second week of intervention.

^dPostintervention score>score at second week of intervention.

^ePostintervention score=score at second week of intervention.

^fN/A: not applicable.