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) |