Ocular manifestations in study groups
| Variable | Total n (%) (N=2400) | Group 1 n (%) (n=1200) | Group 2 n (%) (n=1200) | P value | |
| Ocular manifestations | 168 (7) | 144 (12.0) | 24 (2.0) | <0.001 | |
| Symptoms | Burning sensation of eyes | 96 (4.0) | 80 (6.7) | 16 (1.3) | <0.001 |
| Redness of eyes | 36 (1.5) | 32 (2.7) | 4 (0.3) | <0.001 | |
| Foreign body sensation and irritation of eyes | 88 (3.7) | 84 (7.0) | 4 (0.3) | <0.001 | |
| Signs | Lid and adnexa signs | 0 (0.00) | 0 (0.00) | 0 (0.00) | – |
| Conjunctival signs | 36 (1.5) | 32 (2.7) | 4 (0.3) | <0.001 | |
| Corneal signs | 0 (0.00) | 0 (0.00) | 0 (0.00) | – | |