Table 3.

Reasons for discrepancy by ROP diagnoses provided by five pediatric ophthalmology fellows, compared to diagnosis provided by expert reference standard. All image sets that were diagnosed incorrectly by over half of the fellows were reviewed to identify the most likely source of error as judged by consensus of study authors.

Reasons for discrepancy	Number of imagesa	Percentage
Identification of stage	43	91.5
Identification of plus disease	19	40.4
Identification of zone	16	34.0
Poor image quality	2	4.3
Total number of images	47b	-

^aNumber of images that were diagnosed incorrectly by over half of the fellows. The sum is larger than the total number of images because some images were diagnosed incorrectly by fellows for different reasons.

^bTotal number of images that were diagnosed incorrectly by over half of the fellows