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. 2022 Aug 1;130(8):087002. doi: 10.1289/EHP9985

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Figure 5 is a dot graph, plotting mass-based ratio, ranging from 0 to 1 in increments of 0.1 (y-axis) across the mass ratio of the three brominated species of trihalomethane-4 to trihalomethane 4, ranging from 0.0 to 1.0 in increments of 0.1 (x-axis) for 1998 and 2011. — Cumulative distribution for the mass-based ratio of THM3 (i.e., brominated THMs) to THM4 for common systems between 1998 and 2011 data sets ( $lowercase italic n equals 127$ ). Researchers calculated mass-based ratio for each system from the 1997–1998 Information Collection Rule data set that provided both THM3 and THM4 concentrations and compared to matching ratio from 2011 Six-Year Review 3 data set. Statistical testing performed using R (version 4.1.2; R Development Core Team) for the hypothesis that the means and variances were not different. See Excel Table S9 for underlying data. Note: THM3, three brominated species of THM4; THM4, trihalomethane-4.