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Bivariate analysis of mean macular choroidal thickness by pack-year history of smoking. (a) Fit-line analysis across all patients; red line indicates overall mean, 166 μm; green line indicates fit-line analysis; mean macular choroidal thickness (μm), 186–1.76 (pack-years); (b) Subgroup analysis of patients with drusen or early-atrophic AMD; overall mean, 133 μm; mean macular choroidal thickness (μm), 147–1.02 (pack-years).
