Sensitivity, specificity and inter-grader reliability (κ) for trachoma grading (N=61)
| Active trachoma (TF and/or TI) | TF | TI | |
| Grade assigned N (%) | |||
| iPhone | 25 (41.0%) | 11 (18.0%) | 16 (26.2%) |
| SLR | 24 (39.3%) | 20 (32.8%) | 11 (18.0%) |
| Field grade | 23 (37.7%) | 20 (32.8%) | 11 (18.0%) |
| Sensitivity | |||
| iPhone | 78% (63.9–95.3) | 41% (26.1–94.4) | 91% (82.4–99.4) |
| SLR | 81% (69.0–95.4) | 88% (68.0–94.3) | 76% (50.5–94.4) |
| Field grade | 81% (66.7–95.6) | 88% (68.0–95.0) | 76% (53.7–93.8) |
| Specificity | |||
| iPhone | 91% (80.8–100.0) | 91% (83.1–100.0) | 91% (83.1–100.0) |
| SLR | 97% (89.2–100.0) | 98% (88.2–100.0) | 96% (90.8–99.4) |
| Field grade | 100% (97.5–100.0) | 98% (87.5–100.0) | 96% (90.7–99.3) |
| Inter-grader reliability | |||
| iPhone | 0.86 (0.80–0.90) | 0.63 (0.57–0.73) | 0.83 (0.73–0.86) |
| SLR | 0.78 (0.63–0.83) | 0.76 (0.71–0.81) | 0.65 (0.55–0.71) |
SLR, single lens reflex; TF, follicular trachoma; TI, trachomatous inflammatory-intense.