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. 2024 Aug 15;19(8):e0308930. doi: 10.1371/journal.pone.0308930

Fig 2. Comparison of cigarette butt density to population density (People/km2) among quintiles of Social-Environmental Risk.

Fig 2

Each point represents a census tract. Social-Environmental Risk represents the percentile rank (from 0 to 1) of all census tracts. Lines are linear regression for data within a quintile.