Table 2. Average tear condition evaluation factors in categorized groups.
| N (%) | TBUT (s) | Schirmer test value (mm) | ||||||
|---|---|---|---|---|---|---|---|---|
| Mean ± SD | Kruskal-Wallis P value | Steel P value | Mean ± SD | Kruskal-Wallis P value | Steel P value | |||
| Age (years) | (1) 20–29 | 21 (14.5) | 4.9 ± 3.0 | 0.593 | 1:2 P = 0.968 1:3 P = 0.420 1:4 P = 0.770 | 24.6 ± 11.1 | 0.001 | 1:2 P = 0.124 1:3 P = 0.467 1:4 P = 0.001 |
| (2) 30–39 | 34 (23.4) | 4.6 ± 2.8 | 17.4 ± 12.4 | |||||
| (3) 40–49 | 47 (32.4) | 4.0 ± 2.6 | 20.5 ± 12.0 | |||||
| (4) 50+ | 43 (29.7) | 4.2 ± 2.7 | 12.5 ± 9.1 | |||||
| Total | 145 (100.0) | 4.3 ± 2.7 | – | – | 18.0 ± 11.8 | – | – | |
| Sex | Men | 95 (65.5) | 4.5 ± 3.0 | 0.406 | – | 16.6 ± 11.8 | 0.047 | – |
| Women | 50 (34.5) | 3.9 ± 2.1 | 20.7 ± 11.5 | |||||
| Contact Lens | Non user | 97 (66.9) | 4.2 ± 2.8 | 0.144 | – | 16.5 ± 11.7 | 0.041 | – |
| User | 48 (33.1) | 4.6 ± 2.5 | 20.9 ± 11.6 | |||||
| Current Smoker | No | 119 (82.1) | 4.2 ± 2.5 | 0.601 | – | 19.0 ± 11.7 | 0.016 | – |
| Yes | 26 (17.9) | 4.6 ± 3.5 | 13.3 ± 11.5 | |||||
| Post Ophthalmic Surgery | No | 128 (88.3) | 4.4 ± 2.7 | 0.287 | – | 18.6 ± 11.6 | 0.050 | – |
| Yes | 17 (11.7) | 3.7 ± 2.5 | 13.5 ± 12.4 | |||||
N = number of samples enrolled, TBUT = tear break up time.