Schematic diagram of quantal dose–response relationship of insects’ response to chemicals. (A) Insecticide bioassays for mosquito larvae and adults. (B) Dose–response curve with a cumulative mortality plotted along the y-axis and the logarithm of the dose or concentration being plotted along the x-axis. (C) Mathematical transformation of probit (probability unit) analysis using appropriate computer software. (D) Dose–response curve of mortality in probits with the logarithm of the dose or concentration being plotted along the x-axis and the percent mortalities, converted to probits, being plotted along the y-axis.