75 THE VALUE OF TELEDERMOSCOPY TO THE EXPERTISE OF GPS DIAGNOSING SKIN DISORDERS Table 4.2: Number of (in)correct diagnosed GP cases and positive predictive value over three years’ time. Obtained teledermoscopy cases Not diagnosed by TD (%) Not diagnosed by GP* (%) Diagnosed by GP* (%) Confirmed diagnosed GP cases by TD (%) PPV [95% CI] Incorrect prediagnosed by GP (%) Year 1 July 2015- June 2016 209 26 (12.4) 170 (92.9) 13 (7.1) 11 (6.0) 0.85 [0.58-0.96] 2 (15.4) Year 2 July 2016- June 2017 228 21 (9.2) 180 (87.0) 27 (13.0) 19 (9.2) 0.70 [0.52-0.84] 8 (29.6) Year 3 July 2017- June 2018 222 33 (14.9) 155 (82.0) 34 (18.0) 25 (13.2) 0.74 [0.57-0.85] 9 (26.5) Notes: PPV is calculated as the number of confirmed diagnosed GP cases by TD divided by the number of total obtained teledermoscopy cases minus number not diagnosed by TD and GP. * Total number = obtained teledermoscopy cases minus the cases not diagnosed by TD. CI = confidence interval; PPV = positive predictive value. 4
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