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. 2018 Jan 19;13(1):e0191493. doi: 10.1371/journal.pone.0191493

Table 1. Summary of image characteristics and available demographic information.

Asanc Injed Hallymd Seould
A1 A2 B1 B2 C D
No. of images 49567 3741 100 194 125 939
Patient demographics
 No. of unique individuals 4557a 484 57 61 55 169
 Age, mean (SD), y 40.85 (21.64) 45.61 (20.36) 47.89 (22.62) 53.78 (20.19) 38.57 (15.38) 50.83 (19.52)
 Male, total (%) 45.1% 41.3% 43.9% 52.5% 52.7% 46.2%
Diagnosis
 ;No. of images / total (%) among images
Onychomycosis 6673 (13.5%) 1567 (41.9%) 50 (50.0%) 173 (89.2%) 57 (45.6%) 500(53.2%)
Nail dystrophy 13769 (27.8%) 1095 (29.3%) 50 (50.0%) 21 (10.8%) 68 (54.4%) 439(46.8%)
Onycholysis 2397 (4.8%) 319 (8.5%)
Melanonychia 2290 (4.6%) 359 (9.6%) - - - -
Other nail disordersb 4439 (9.0%) - - - - -
Normal 19999 (40.3%) - - - - -

aUnique patient codes and individual data, including age and sex, were available for 84.4% of the A1 dataset (n = 41,813 images).

bSubungual hemorrhage, paronychia, subungual fibroma, ingrown nail, pincer nail, periungual wart, etc.

cDiagnosis was based on the image findings (A1 dataset), whereas clinical diagnosis was identified in the chart (A2 dataset). Fungal culture was performed in 64.7% (313 of 484 patients) of the A2 dataset, and in frequency of positive cultures, onychomycosis specimens accounted for 34.6% of positive cultures (118 of 341 specimens), and non-onychomycosis specimens accounted for 3.4% (5 of 149).

dThe inclusion criteria for onychomycosis in the validation dataset were a positive KOH test or fungus culture result, or the successful treatment with antifungal drugs. The inclusion criteria for nail dystrophy were a negative KOH test or culture result, unresponsiveness to antifungal medication, or responsiveness to a triamcinolone intralesional injection. All the cases of B1 dataset were confirmed by fungal culture and all the cases of D dataset were confirmed by KOH test.