Correlation of ocular surface function with sleep quality, anxiety, and depression in patients with dry eye disease

Table 1 Distribution of sleep quality scores among the patients, n (%)/mean ± SD

Variable	Number	PSQI	Statistic	P value
Total	358 (100)	9.94 ± 2.18
Age (years)			t = -2.34	0.020
< 50	213 (59.50)	9.71 ± 2.03
≥ 50	145 (40.50)	10.27 ± 2.35
Gender			t = -0.28	0.780
Female	243 (67.88)	9.91 ± 2.25
Male	115 (32.12)	9.98 ± 2.02
Degree of education			t = -2.20	0.028
College or higher	77 (21.51)	9.45 ± 2.37
Below college	281 (78.49)	10.07 ± 2.11
Hypertension			t = -1.48	0.140
No	239 (66.76)	9.82 ± 2.18
Yes	119 (33.24)	10.18 ± 2.17
Diabetes			t = -1.72	0.086
No	283 (79.05)	9.83 ± 2.16
Yes	75 (20.95)	10.32 ± 2.20
Duration of illness			t = -1.51	0.133
< 12 months	188 (52.51)	9.77 ± 2.19
≥ 12 months	170 (47.49)	10.12 ± 2.16

PSQI: Pittsburgh Sleep Quality Index.