FIG 3.

Scatterplot of tetanus MBA responses versus DAE responses. Tetanus antibody levels of women aged 15 to 39 years in Cambodia were determined by a gold-standard DAE and a novel MBA. A DAE result of <0.01 IU/ml was considered seronegative for tetanus (white circles), and ≥0.01 IU/ml was considered seroprotective (black circles) (19). Linear regression was performed on log-transformed DAE values between 0.004 and 1.6 IU/ml, where the regression line (gray) had the equation log (MBA result) = 1.16 log (DAE result) + 4.32. On the basis of this analysis, MBA values of ≥100 MFI-bg units were considered seroprotected. The regression line goodness of fit was assessed with the r² statistic, where 0.0 represents no linear relationship between the results and 1.0 represents a perfect linear relationship.