Table 2.

Demographic characteristics of the study population (N = 90)

Characteristics		Severity of dry eye patients, n (%)a			χ 2 value	P value
		Mild (n = 24)	Moderate (n = 36)	Severe (n = 30)
Age	< 35	2 (8.3)	10 (27.8)	16 (66.7)	21.915	< 0.001
	[35,55)	8 (33.3)	9 (25.0)	6 (25.0)
	≥ 55	14 (58.3)	17 (47.2)	2 (8.3)
Sex	Male	7 (29.2)	10 (27.8)	15 (53.6)	5.267	0.072
	Female	17 (70.8)	26 (72.2)	13 (46.4)

^aSome variables contained missing values, thus the proportion in bracket () was valid proportion; severity groups were classified according to clinical diagnosis