Comparison of success rates after medical treatment in patients with congenital nasolachrymal duct obstruction (CNLDO) and CNLDO plus otitis media with effusion (OME)
| Treatment groups | CNLDO only | CNLDO + OME |
| <13 months of age (medical treatment) | 14/16 (87.5%) | 3/8 (37.5%) |
| 13–24 months (medical treatment and probing) | 6/8 (75%) | 3/9 (33.3%) |
| >24 months (probing) | 8/12 (66.6%) | 4/12 (25%) |