Table 2.
Agreement (kappa statistic) between external readers 1 and 2 1.
| N1 2 | N2 3 | Kappa | 95% CI | Agreement | |
|---|---|---|---|---|---|
| Any abnormality | 397 | 418 | 0.561 | 0.474, 0.648 | Moderate |
| TB (possible or probable/definite) 4 | 213 | 264 | 0.655 | 0.570, 0.741 | Substantial |
| TB probable/definite 4 | 128 | 216 | 0.572 | 0.491, 0.653 | Moderate |
| Silicosis ≥ ILO 1/0 (irrespective of TB) | 119 | 109 | 0.501 | 0.413, 0.588 | Moderate |
| Silicosis ≥ 1/1 (irrespective of TB) | 112 | 80 | 0.565 | 0.479, 0.650 | Moderate |
| Silicotuberculosis ≥ 1/0 | 74 | 66 | 0.320 | 0.232, 0.407 | Fair |
| Silicotuberculosis ≥ 1/1 | 72 | 47 | 0.384 | 0.299, 0.469 | Fair |
1. “Reader 2” = consensus read between two readers. 2. Number read as disease positive by reader 1. 3. Number read as disease positive by reader 2. 4. Whether read as active, prior or both.