Table 2. Data distribution according to pterygium extension over the limbus (grades 1–4).

	Grades 1–2		Grades 3–4
	Mean ± SD	95% CI	Mean ± SD	95% CI	P value
Age (years)	51.5 ± 11.3	47.3–55.6	57.1 ± 10.9	52–62.2	0.09
K1	43.2 ± 2	42.5–44	42.8 ± 3.8	40.7–45	0.92
K2	44.9 ± 1.9	44.1–45.6	47.5 ± 3.2	45.7–49.3	0.001*
Corneal astigmatism (pterygium)	1.6 ± 1.1	1.1–2	4.6 ± 3.3	2.7–6.4	0.006*
NITBUT	9.8 ± 4.8	8.1–11.6	9.9 ± 5.1	7.6–12.3	0.95
Conjunctival hyperemia	2.7 ± 0.6	2.4–2.9	2.7 ± 0.6	2.4–3	0.96
Tear meniscus height	0.3 ± 0.1	0.3–0.4	0.3 ± 0.1	0.2–0.4	0.27
Red eye (0–10)	7.7 ± 3	6.3–9.1	8 ± 2.1	6.7–9.4	0.96
Irritation (0–10)	7.1 ± 1.7	6.3–7.9	6.5 ± 3.4	4.3–8.6	0.92
Tearing (0–10)	5.8 ± 3.6	4.1–7.4	6 ± 3.9	3.4–8.5	0.76
Blurred vision (0–10)	6.7 ± 3.5	5.1–8.3	7.2 ± 2.9	5.4–9	0.95
Aesthetics (0–10)	7.9 ± 3	6.5–9.3	7.5 ± 3.2	5.4–9.5	0.66