Stratified analysis of change from baseline scores by age in corneal staining score and dryness score
| Age (years) | N | Corneal staining score (Mean±SE) | p value* | Dryness score (Mean±SE) | p value* |
| 20–29 | 30 | −0.63±0.24 | 0.02 | −0.03±0.12 | 0.24 |
| 30–39 | 19 | −0.58±0.31 | −0.21±0.15 | ||
| 40–49 | 24 | −1.01±0.27 | −0.25±0.13 | ||
| 50–59 | 30 | −0.86±0.24 | −0.30±0.12 | ||
| 60–69 | 49 | −1.41±0.19 | −0.43±0.09 | ||
| 70–79 | 51 | −1.29±0.19 | −0.33±0.09 | ||
| ≥80 | 2 | −3.00±0.94 | 0.00±0.46 |
*One-way analysis of variance.