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Table 2 Overall and RUCC-stratified domain variable means, standard deviations, ranges for select variables in the water domain

From: Construction of an environmental quality index for public health research

   Metropolitan - urbanized Non-metro urbanized Less-urbanized Thinly populated Overall
   (RUCC1 = 1089) (RUCC2 = 323) (RUCC 3 = 1059) (RUCC4 = 670) (n = 3141)
Variable (construct) Units Mean (sd) [range] Mean (sd) [range] Mean (sd) [range] Mean (sd) [range] Mean (sd) [range]
Impaired stream length in county percent 14.004 (16.528) 14.203 (20.403) 8.791 (12.682) 6.537 (9.470) 10.674 (14.853)
(Overall water quality) [0, 92.570] [0, 94.450] [0, 95.740] [0, 98.500] [0, 98.500]
Industrial Permits permits/1000 km 51.139 (96.466) 27.241 (31.332) 18.423 (38.732) 10.080 (22.009) 28.893 (64.947)
(General water contamination) [0, 1195.680] [0, 280.860] [0, 674.150] [0, 337.300] [0, 1195.680]
Number of days of beach closure days 3.229 (19.625) 1.421 (9.859) 0.143 (1.945) 0.022 (0.508) 1.318 (12.118)
(Recreational water quality) [0, 365.000] [0, 116.000] [0, 55.000] [0, 13.000] [0, 365.000]
Percent of Public Supply Population on Surface Water percent 46.863 (41.736) 41.922 (41.306) 33.775 (40.841) 21.942 (36.526) 36.627 (41.386)
(Domestic use water quality) [0, 100.000] [0, 100.000] [0, 100.000] [0, 100.000] [0, 100.000]
Calcium (Ca) precipitation weighted mean mg/L 0.192 (0.120) 0.217 (0.130) 0.255 (0.144) 0.279 (0.144) 0.231 (0.139)
(Atmospheric deposition) [0.040, 0.594] [0.043, 0.634] [0.042, 1.183] [0.047, 0.806] [0.040, 1.183]
Total Mercury (Hg) deposition ng/M2 4.784 (1.249) 4.635 (1.364) 4.780 (1.397) 4.520 (1.405) 4.711 (1.350)
(Atmospheric deposition) [1.101, 9.219] [1.100, 7.950] [1.109, 8.473] [1.103, 8.458] [1.100, 9.219]
Percent of county drought – extreme (D3-D4) percent 3.160 (5.273) 3.522 (6.215) 3.908 (6.931) 5.030 (8.577) 3.848 (6.777)
(Drought) [0, 46.900] [0, 42.430] [0, 40.400] [0, 48.800] [0, 48.800]
Alpha Particles PCl/L 1.034 (2.333) 1.113 (1.851) 1.364 (3.517) 0.781 (2.053) 1.099 (2.711)
(Chemical contamination) [0, 35.800] [0, 11.390] [0, 51.450] [0, 18.100] [0, 51.450]
Selenium mg/L 3.13E-03 (4.73E-03) 2.93E-03 (3.65E-03) 3.00E-03 (5.12E-03) 2.25E-03 (4.45E-03) 4.72E-03 (2.88E-03)
(Chemical contamination) [0, 5.00E-02] [0, 3.00E-02] [0, 9.40E-02] [0, 4.70E-02] [0, 9.40E-02]
Silvex ug/L 0.384 (1.020) 0.579 (1.836) 0.384 (1.087) 0.184 (0.633) 0.362 (1.096)
(Chemical contamination) [0, 5.000] [0, 25.250] [0, 12.500] [0, 5.000] [0, 25.250]
Chlordane ug/L 0.088 (0.100) 0.099 (0.096) 0.090 (0.097) 0.068 (0.094) 0.086 (0.098)
(Chemical contamination) [0, 0.950] [0, 0.273] [0, 0.267] [0, 0.200] [0, 0.950]
Tetrachloroethylene ug/L 0.460 (0.584) 0.397 (0.376) 0.407 (0.771) 0.325 (0.300) 0.407 (0.595)
(Chemical contamination) [0, 8.000] [0, 5.110] [0, 23.750] [0, 4.330] [0, 23.750]
1,2-Dichloropropane ug/L 0.360 (0.232) 0.364 (0.243) 0.368 (0.217) 0.313 (0.240) 0.353 (0.231)
(Chemical contamination)   [0, 1.270] [0, 1.900] [0, 0.560] [0, 0.620] [0, 1.900]
  1. Complete list of variables is available in Additional file 2.