Fig. 2: Lab validation of the WaterScope system.
From: Expanding access to water quality monitoring with the open-source WaterScope testing platform
Test were performed on lab-strain E. coli across a five-fold dilution series with 14 samples at each dilution for WaterScope (WS - red), CCA (blue, ISO 9308-1), Colilert-18 (orange, ISO 9308-2) and MLSB (green) approaches. a Scatterplots of WS counts vs reference method counts, with linear trendline fitted. b Mean-difference plots comparing WS and reference methods, right-panel shows mean value (circle) and 95% confidence interval (error bars) with kernel density approximation (violin plot) for each reference. c Target CFU of the dilution series plotted against average counts from each method. Error bars represent one standard deviation. d Correlation matrix showing Spearman rank for different methods. Note that the Most Probable Number (MPN) approach was used with Colilert-18.
