Figure 3 Superimposed estimated bimodal distributions of log₁₀(HIV RNA in copies/ml) for the MACS and WIHS by different years from HAART initiation. Negative values on the x axis represent less than 1 copy/ml (for example, −2 corresponds to 1 copy/100 ml). The solid line is for the MACS and the dashed line is for the WIHS. The p value in each panel was obtained from likelihood ratio test to examine whether the mixture distributions from the two cohorts were different.