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. 2013 Aug 7;89(2):251–259. doi: 10.4269/ajtmh.13-0067

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Figure 3. — Relationship between the percentage of H₂S positive tests and log₁₀ total coliform concentration for village source samples (left) and household samples (right) using mean concentrations at the village level. N = 695 village source samples; N = 3,026 household samples. The fitted line in the village source samples is a weighted least squares fit with parameters H₂S = −92.9 + 51.0 × log₁₀TC, R² = 0.87. The parameters fit including both village (left) and household samples (right) was similar: H₂S = −90.2 + 51.3 × log₁₀TC, R² = 0.81, and the fit was not greatly improved using a logistic instead of linear model.