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Table 1 Mean and standard deviation for pollutant concentrations in each terminal node, Atlanta, Georgia, 1999 - 2009

From: Classification and regression trees for epidemiologic research: an air pollution example

Terminal node N CO NO2 O3 PM2.5
   Mean (SD) Mean (SD) Mean (SD) Mean (SD)
Overall 4010 0.57 (0.3) 21.07 (7) 43.76 (17.45) 14.06 (5.78)
Referent group 131 0.27 (0.04) 11.9 (2.74) 24.68 (3.88) 6.81 (1.4)
T1 316 0.5 (0.18) 16.68 (2.91) 57.09 (14.05) 21.13 (3.76)
T2 279 0.53 (0.21) 24.13 (2.74) 35.77 (9.84) 8.47 (1.05)
T3 1039 0.68 (0.31) 26.05 (4.31) 41.02 (14.89) 13.26 (1.98)
T4 441 0.67 (0.28) 27.3 (5.31) 72.19 (12.72) 23.66 (4.74)
T5 91 0.33 (0.07) 17.03 (2.42) 60.25 (5.05) 13.77 (2.51)
T6 68 0.66 (0.09) 16.54 (3.17) 62.49 (5.81) 13.94 (2.36)
T7 76 0.71 (0.37) 22.63 (1.29) 41.33 (13.27) 19.26 (2.07)
T8 168 1.13 (0.42) 33.31 (7.08) 38.65 (11.11) 21.18 (4.36)
T9 458 0.44 (0.21) 12.69 (2.58) 30.83 (7.76) 9.83 (2.67)
T10 263 0.5 (0.24) 18.46 (1.22) 23.34 (4.87) 10.18 (2.67)
T11 435 0.44 (0.17) 18.27 (1.28) 42.35 (7.06) 11.46 (2.95)
T12 160 0.37 (0.15) 12.74 (2.3) 47.08 (3.42) 10.1 (1.9)
T13 85 0.45 (0.17) 13.65 (1.98) 49.26 (3.99) 14.69 (0.98)