Table 5: Comparison of RBT results from two technicians and c-ELISA results ( = 395).

Agreement (%)Expected agreement (%)KappaStd. err. value

RBT1_RBT264.8 54.70.220.0400.0000
RBT1_c-ELISA71.254.10.370.0440.0000
RBT2_c-ELISA84.1 69.90.470.0500.0000

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.