Figure 1. Kaplan-Meier estimates of time to loss to follow-up by baseline CD4 value (top) and by baseline CD4 by gender/pregnancy at ART initiation status (bottom).
Note that the y-axes range from 0.7 to 1.0. Loss to follow-up is defined as not returning ≥3 months after the last scheduled visit; thus, person-time begins accumulating at 3 months.