Table 2. Overdiagnosis Rates by Specialty of Referral Source.
| Specialty | No./Total No. (%) | 95% CI | |
|---|---|---|---|
| Referrals | Overdiagnosis Rate | ||
| Ophthalmology | 57/122 (46.7) | 36/56 (64) | 49.3-75.6 |
| Optometry | 43/122 (35.2) | 25/43 (58) | 42.1-73.0 |
| Neurology | 19/122 (15.6) | 11/19 (58) | 33.5-79.8 |
| Family medicine | 2/122 (1.6) | 0/2 (0) | NA |
| Neuro-ophthalmology (2nd opinion) | 1/122 (0.8) | 1/1 (100) | NA |
| Total, No. | 122 | 73 | 50.6-68.6a |
Abbreviation: NA, not applicable.
a
P = .85. The P value refers to a χ2 test comparing misdiagnosis rates among Ophthalmology (64%), optometry (58%), and neurology (58%), indicating that there is no significant difference in overdiagnosis among these 3 specialties. Family medicine and neuro-ophthalmology were excluded from the analysis, as they had referred only 2 and 1 patients, respectively.