TABLE 2.

Pairwise concordance among laboratoriesa

LaboratoriesConcordance (%)Kappa valueb
1 vs 2900.7961
1 vs 3940.8796
1 vs 4880.7577
2 vs 3900.7981
2 vs 4910.8148
3 vs 4900.7990
  • a 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).

  • b Kappa values above 7.0 denote satisfactory reliability.