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Table 2 Gradability of the images as marked by each grader and agreement with the reference grader

From: Diagnostic test accuracy of diabetic retinopathy screening by physician graders using a hand-held non-mydriatic retinal camera at a tertiary level medical clinic

Gradability percentage of the retinal fields Non-mydriatic imaging Mydriatic imaging
Grader 1 Nc = 1392 Grader 2 N = 1391 Grader 1 N = 1381 Grader 2 N = 1380
Gradable
 100% a 286 (20.5%) 352 (25.3%) 537 (38.9%) 605 (43.8%)
 75% 308 (22.1%) 431 (31.0%) 395 (28.6%) 519 (37.6%)
 50% 386 (27.7%) 276 (19.8%) 351 (25.4%) 186 (13.5%)
Ungradable
 <50% 412 (29.6%) 332 (23.9%) 98 (7.1%) 70 (5.1%)
Inter-grader Agreement b, kappa (95% CI) 0.90 (0.85,0.95) 0.90 (0.86,0.95) 0.72 (0.56,0.89) 0.96 (0.89,1.03)
  1. a. Percentage of visibility in a given field, by eyes
  2. b. Physician grader vs retinologist – grading a random sample of image sets (n = 212, total n = 424)
  3. c. Number of image sets by eyes