Table 2.

Descriptive data for postoperative interventions to prevent corneal haze in relation to the independent variables, latitude and average sunshine days.

	Frequency	Percent	Latitude				Average sunshine days
			Min	Max	Median	P value	Min	Max	Median	p value
Intraoperative Mitomycin C
Never, sometimes or in certain cases	26	47.1	19.92	59.95	39.73		152	265	211
Always or almost always	25	39.22	6.23	51.97	36.02	0.391	133	300	217	0.177
Oral Vitamin C
Never or almost never	19	41.2	6.23	47.62	35.23		152	292	214
Sometimes or in certain cases	7	13.7	17.37	51.97	39.73	0.677	133	300	214
Always or almost always	18	37.3	19.92	59.95	38.69		160	281	206	0.92
Ultraviolet protection (e.g. sunglasses)
Never or almost never	5	9.8	26.37	42.27	36.02		178	292	265
Sometimes or in certain cases	4	9.8	25.78	51.97	39.97		133	249	200
Always or almost always	35	78.4	6.23	59.95	36.00	0.692	152	300	214	0.189
Topical corticosteroids beyond initial one month post-operative period
Never or Almost never	9	19.6	19.92	59.95	36.02		196	292	214
Sometimes or in certain cases	9	17.6	25.78	46.88	34.00		167	284	197
Always or almost always	26	56.9	6.23	51.97	39.68	0.752	133	300	214	0.489
Topical cyclosporine (e.g. Restasis)
Never or almost never	28	54.9	6.2	59.9	38.19		133	300	214
Sometimes or in certain cases	17	33.3	5.5	45.70	31.40	0.381	167	284	208	0.338
(or) always or almost always
Amniotic membrane graft
Never or almost never	43	88.2	6.23	59.95	36.02		133	300	214
Sometimes or in certain cases	1	2				n/a				n/a
Oral tetracycline, doxycycline or minocycline
Never or almost never	35	68.6	6.23	59.95	36.02		152	300	214
Sometimes or in certain cases	10	19.6	32.47	51.97	39.58	0.375	133	284	199	0.332
(or) always or almost always