Table 4. Ocular surface symptoms in the study and control groups.

Symptoms	Study group (n = 70)	Control group (n = 35)	P-value*
Dryness	2 (0–2)	0 (0–1)	0.001Δ
Gritty or sandy	1 (0–2)	0 (0–0)	< 0.001Δ
Burning sensation	0 (0–0)	0 (0–0)	0.103
Sticky	0 (0–1)	0 (0–0)	0.646
Watery or teary	0 (0–2)	0 (0–1)	0.441
Redness	0 (0–0.25)	0 (0–0)	0.048Δ
Crusting on eyelashes	0 (0–0)	0 (0–0)	0.097
Itching	1 (0–2)	0 (0–1)	0.061

Values are shown as the median (interquartile range).

* P-values were derived from Mann-Whitney U-tests.

^ΔStatistical significance (P < 0.05).