Sensitivity and specificity of the lateral flow test at different read times.

Four different people read the test results over these time points. At days 30 and 70 the tests were read by two readers indicated by superscripts 1 and 2. For this sample size (n = 100), a change of 0.02 in sensitivity or specificity represents a discordance in 1 test result. For test development results throughout drying, the correlation coefficients for 1 hour and 24 hours were calculated relative to the 20 minutes test results(*). The remaining time points give the correlation coefficients calculated relative to the 24-hour dry reads.