Table 4.
Drug preferred
| LASIK (n=67) | PRK (n=61) | Combined sample (n=128) | |
|---|---|---|---|
| Proparacaine, n (%) | 22 (33) | 28 (46) | 50 (39) |
| Tetracaine, n (%) | 34 (51) | 20 (33) | 54 (42) |
| No preference, n (%) | 11 (16) | 13 (21) | 24 (19) |
| Adjusted OR* (95% CI), odds of preferring proparacaine to tetracaine | OR 0.39 | OR 1.80 | NA** |
| 95% CI 0.18–0.86 | 95% CI 0.79–4.11 | ||
| P-value | 0.019 | 0.16 | |
Notes:
*
After dropping the “no preference” patients, and then controlling for order of instillation in a mixed effects logistic regression model. **not applicable since effect measure modification occurred, where the effect is in the opposite direction depending on type of surgery.
Abbreviations: CI, confidence interval; OR, odds ratio; LASIK, laser in situ keratomileusis; PRK, photorefractive keratectomy; NA, not applicable.