Table 3.

Main effects of the number of devices and tailoring on dimensions of acceptability.

Acceptability dimension	Main effect (devices)a				Main effect (tailoring)a
	Mean square	F test (df)	P value	Mean square		F test (df)	P value
Interest	8.99	7.02 (1)	.008	198.43		154.85 (1)	<.001
Benefit	4.58	4.16 (1)	.04	120.27		109.33 (1)	<.001
Usefulness	9.33	8.30 (1)	.004	163.43		145.43 (1)	<.001
Enjoyment	0.35	0.30 (1)	.59	132.34		111.70 (1)	<.001
Confidence	47.26	40.69 (1)	<.001	17.06		14.69 (1)	<.001
Difficulty	100.06	81.93 (1)	<.001	1.57		1.28 (1)	.26
Likelihood to participate	5305.45	5.83 (1)	.02	58,210.97		63.96 (1)	<.001

^aThe manipulations of tailoring and the number of devices across dimensions of acceptability did not reveal any significant interaction effects.