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Pairwise concordance among laboratoriesa
| Laboratories | Concordance (%) | Kappa valueb |
|---|---|---|
| 1 vs 2 | 90 | 0.7961 |
| 1 vs 3 | 94 | 0.8796 |
| 1 vs 4 | 88 | 0.7577 |
| 2 vs 3 | 90 | 0.7981 |
| 2 vs 4 | 91 | 0.8148 |
| 3 vs 4 | 90 | 0.7990 |
Hartley's test of homogeneity indicated no significant difference among the laboratories. One-way ANOVA of the ODs among the laboratories with an F value of 0.179 also indicated no significant difference (P < 0.05).
Kappa values above 7.0 denote satisfactory reliability.
