The effect of the Yara smartphone application on anxiety, sleep quality, and suicidal thoughts in patients with major depressive disorder in Iran: a randomized controlled trial

Table 4 Comparison of the mean score of sleep quality between two intervention and control groups before and after the intervention

Variable	Time	Intervention group	Control group	Independent t-test
Variable	Time	Mean±SD^c	Mean±SD	Independent t-test
Sleep quality	Pre-Interv.^a	12.31±4.37	12.94±4.78	t = - 0.546 df = 62 P = 0.587
	Post- Interv.^b	13.03±4.25	4.06±2.51	t = - 10.282 df = 62 P < 0.001
	Paired t-test	t = 8.585 df = 31 P < 0.001	t = - 0.073 df = 31 P = 0.942

ISSN: 1471-244X