Variable | Group 1 (n = 28) | Group 2 (n = 23) | Group 3 (n = 19) | Group 4 (n = 30) | P value |
Mean TBUT ± SD (sec) | 14.8 ± 1.8 | 14.2 ± 2.1 | 13.6 ± 1.5 | 12.8 ± 1.2 | <0.001 |
Mean Schirmer-1 measurement ± SD (mm in 5 min) | 23.11 ± 6.2 | 21.6 ± 5 | 21.6 ± 3.8 | 18.8 ± 3.7 | 0.01 |
Mean OSDI score ± SD | 11.8 ± 14.2 | 16.1 ± 15.6 | 19.6 ± 14.9 | 22.5 ± 14.7 | < 0.001 |