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Comparison of RBT results from two technicians and c-ELISA results (n = 395).
| Agreement (%) | Expected agreement (%) | Kappa | Std. err. | P value | |
|---|---|---|---|---|---|
| RBT1_RBT2 | 64.8 | 54.7 | 0.22 | 0.040 | 0.0000 |
| RBT1_c-ELISA | 71.2 | 54.1 | 0.37 | 0.044 | 0.0000 |
| RBT2_c-ELISA | 84.1 | 69.9 | 0.47 | 0.050 | 0.0000 |
NB: RBT1: RBT test results from an elderly technician (1) with aided sight; RBT2: RBT test results from a young technician without sight defect correction; Std. err.: standard error.
