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. 2023 Apr 3;34(3):353–364. doi: 10.1097/EDE.0000000000001604

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FIGURE 2. — Observed proportion recent by time with fitted $q (t)$ estimated using a generalized additive model (black line). ODn < 1.5 is considered recent by the assay and ODn $\geq$ 1.5 is considered nonrecent.