Table 3.

Distribution of baseline characteristics of vernal keratoconjunctivitis cases and controls with their differences, expressed in P value

	Cases (N = 121)		Controls (N = 363)		P value
	n	%	n	%
Age
7–9 years	33	27.3	96	26.5
10–11 years	34	28.1	117	32.2
12–14 years	54	44.6	150	41.3	0.773
Male gender	78	64.5	174	48.1	0.002
Urban environment	65	53.7	195	53.7	1
Hot climate	75	62.0	225	62.0	1
Total economic level
Poor	15	12.4	55	15.36
Middle	52	42.98	153	42.74
Rich	54	44.63	150	41.9	0.442
House rent
Low	58	48.33	191	52.62
Middle	31	25.83	109	30.03
High	31	25.83	63	17.36	0.12
Higher educational level	31	25.62	78	21.55	0.355