Table 7.

Group comparisons of the subjective app ratings [19] with t tests for independent samples. Mean, SD, t test values, and P values are described for each item.

Item (1=strongly disagree, 5=strongly agree)	Mean (SD) CGa	Mean (SD) EGb	t (df)	P value
The app facilitates relaxation.	3.58 (1.12)	2.90 (1.17)	1.85 (37)	.07
The app is pleasant to use.	4.00 (0.94)	3.70 (0.98)	0.97 (37)	.34
It is easy to follow the app instructions.	4.74 (0.56)	4.15 (1.14)	2.06 (37)	.049
The app effectively teaches how to breathe.	4.37 (1.07)	4.25 (0.91)	0.37 (37)	.71
The app is effective in reducing stress.	3.74 (1.10)	2.90 (1.12)	2.36 (37)	.02
The app is effective in increasing attention to breathing.	4.63 (0.76)	4.55 (0.69)	0.35 (37)	.73

^aCG: control group.

^bEG: experimental group.