Table 3.

Construct validity measured with multitrait scaling analysis.

Subscale and item		Corrected item-subscale correlation	Success ratea
			Convergent validity	Divergent validity
Engagement			4/5	4/5
	Item 1	0.35
	Item 2	0.61
	Item 3	0.65
	Item 4	0.53
	Item 5	0.62
Functionality			4/4	4/4
	Item 6	0.59
	Item 7	0.55
	Item 8	0.81
	Item 9	0.73
Aesthetics			3/3	3/3
	Item 10	0.68
	Item 11	0.84
	Item 12	0.83
Information			3/6	4/6
	Item 13	0.24
	Item 14	0.33
	Item 15	0.74
	Item 16	0.75
	Item 17	0.39
	Item 18	0.49
	Item 19b	—c	—	—
Subjective qualityd
	Item 20	0.83	—	—
	Item 21	0.84	—	—
	Item 22	0.55	—	—
	Item 23	0.78	—	—

^aSuccess rate was defined as the rate of prespecified acceptable items among all items in each subscale.

^bItem 19 was eliminated from the analysis because of missing values.

^cNot applicable.

^dSuccess rate was not calculated for subjective quality.