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. Author manuscript; available in PMC: 2021 Nov 1.
Published in final edited form as: Genes Immun. 2021 May 1;22(2):65–74. doi: 10.1038/s41435-021-00130-y

Figure 2. Kaplan-Meier curves showing the impact of HIV-1 viral load (VL) in donor/index partners on heterosexual HIV-1 transmission among 420 HIV-1 discordant Zambian couples with longitudinal follow-up.

Figure 2.

The three VL categories followed earlier strategies [83], and subjects with low VL (<10−4 RNA copies/ml of plasma) were treated as the reference (ref.) group. The estimates of relative hazards (RH) and 95% confidence interval (CI) were based on a Cox proportional hazards model. Graph is redrawn from data published in 2008 [17]. Couples that remained eligible for further assessment at various follow-up intervals are indicated below the curves.