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Table 2 Frequency at which each Day-Type (n = 64) occurred by city, as well as the terminal node designation from the city-specific trees

From: Associations between ambient air pollutant mixtures and pediatric asthma emergency department visits in three cities: a classification and regression tree approach

Day- Typea Atlanta Dallas St. Louis
N % Terminal Nodeb N % Terminal Nodec N % Terminal Noded
1/1/1 606 (15.1 %) Referent 121 (9.1 %) Referent 115 (4.9 %) Referent
1/1/2 137 (3.4 %) 1A 29 (2.2 %) 1D 30 (1.3 %) 6S
1/1/3 98 (2.4 %) 1A 30 (2.2 %) 1D 25 (1.1 %) 6S
1/1/4 24 (0.6 %) 1A 6 (0.4 %) 1D 11 (0.5 %) 1S
1/2/1 137 (3.4 %) 5A 46 (3.4 %) 1D 152 (6.5 %) 3S
1/2/2 56 (1.4 %) 5A 9 (0.7 %) 1D 46 (2 %) 7S
1/2/3 70 (1.7 %) 5A 4 (0.3 %) 1D 63 (2.7 %) 7S
1/2/4 21 (0.5 %) 5A 1 (0.1 %) 1D 26 (1.1 %) 1S
1/3/1 61 (1.5 %) 5A 70 (5.2 %) 1D 171 (7.3 %) 2S
1/3/2 46 (1.1 %) 5A 9 (0.7 %) 1D 47 (2 %) 2S
1/3/3 70 (1.7 %) 5A 5 (0.4 %) 1D 86 (3.7 %) 2S
1/3/4 33 (0.8 %) 5A 0 (0 %) 1D 43 (1.8 %) 2S
1/4/1 11 (0.3 %) 4A 114 (8.5 %) 1D 84 (3.6 %) 2S
1/4/2 23 (0.6 %) 4A 18 (1.3 %) 1D 63 (2.7 %) 2S
1/4/3 41 (1 %) 4A 0 (0 %) 1D 99 (4.2 %) 2S
1/4/4 28 (0.7 %) 4A 0 (0 %) 1D 101 (4.3 %) 2S
2/1/1 221 (5.5 %) 1A 116 (8.7 %) 1D 30 (1.3 %) 3S
2/1/2 92 (2.3 %) 1A 34 (2.5 %) 1D 13 (0.6 %) 6S
2/1/3 104 (2.6 %) 1A 41 (3.1 %) 1D 19 (0.8 %) 6S
2/1/4 25 (0.6 %) 1A 19 (1.4 %) 1D 14 (0.6 %) 1S
2/2/1 80 (2 %) 6A 16 (1.2 %) 1D 47 (2 %) 3S
2/2/2 32 (0.8 %) 6A 10 (0.7 %) 1D 12 (0.5 %) 7S
2/2/3 31 (0.8 %) 6A 5 (0.4 %) 1D 17 (0.7 %) 7S
2/2/4 10 (0.2 %) 6A 1 (0.1 %) 1D 4 (0.2 %) 1S
2/3/1 42 (1 %) 7A 28 (2.1 %) 1D 69 (2.9 %) 2S
2/3/2 21 (0.5 %) 7A 7 (0.5 %) 1D 18 (0.8 %) 2S
2/3/3 31 (0.8 %) 7A 2 (0.1 %) 1D 19 (0.8 %) 2S
2/3/4 16 (0.4 %) 7A 0 (0 %) 1D 3 (0.1 %) 2S
2/4/1 7 (0.2 %) 4A 54 (4 %) 1D 58 (2.5 %) 2S
2/4/2 11 (0.3 %) 4A 6 (0.4 %) 1D 31 (1.3 %) 2S
2/4/3 26 (0.6 %) 4A 0 (0 %) 1D 33 (1.4 %) 2S
2/4/4 26 (0.6 %) 4A 1 (0.1 %) 1D 17 (0.7 %) 2S
3/1/1 123 (3.1 %) 2A 59 (4.4 %) 5D 11 (0.5 %) 3S
3/1/2 88 (2.2 %) 2A 34 (2.5 %) 2D 10 (0.4 %) 6S
3/1/3 154 (3.8 %) 2A 30 (2.2 %) 2D 17 (0.7 %) 6S
3/1/4 80 (2 %) 2A 12 (0.9 %) 2D 12 (0.5 %) 1S
3/2/1 33 (0.8 %) 2A 17 (1.3 %) 5D 24 (1 %) 3S
3/2/2 23 (0.6 %) 2A 11 (0.8 %) 2D 12 (0.5 %) 7S
3/2/3 45 (1.1 %) 2A 16 (1.2 %) 2D 24 (1 %) 7S
3/2/4 39 (1 %) 2A 4 (0.3 %) 2D 14 (0.6 %) 1S
3/3/1 21 (0.5 %) 2A 28 (2.1 %) 6D 31 (1.3 %) 2S
3/3/2 26 (0.6 %) 2A 11 (0.8 %) 2D 18 (0.8 %) 2S
3/3/3 37 (0.9 %) 2A 7 (0.5 %) 2D 23 (1 %) 2S
3/3/4 26 (0.6 %) 2A 1 (0.1 %) 2D 14 (0.6 %) 2S
3/4/1 4 (0.1 %) 2A 35 (2.6 %) 6D 44 (1.9 %) 2S
3/4/2 9 (0.2 %) 2A 7 (0.5 %) 2D 43 (1.8 %) 2S
3/4/3 23 (0.6 %) 2A 6 (0.4 %) 2D 45 (1.9 %) 2S
3/4/4 42 (1 %) 2A 4 (0.3 %) 2D 14 (0.6 %) 2S
4/1/1 22 (0.5 %) 3A 15 (1.1 %) 3D 0 (0 %) 3S
4/1/2 38 (0.9 %) 3A 17 (1.3 %) 3D 7 (0.3 %) 6S
4/1/3 111 (2.8 %) 3A 25 (1.9 %) 3D 7 (0.3 %) 6S
4/1/4 216 (5.4 %) 3A 11 (0.8 %) 3D 19 (0.8 %) 1S
4/2/1 11 (0.3 %) 3A 14 (1 %) 4D 8 (0.3 %) 3S
4/2/2 17 (0.4 %) 3A 10 (0.7 %) 4D 5 (0.2 %) 7S
4/2/3 60 (1.5 %) 3A 26 (1.9 %) 4D 10 (0.4 %) 7S
4/2/4 164 (4.1 %) 3A 5 (0.4 %) 4D 27 (1.1 %) 1S
4/3/1 7 (0.2 %) 3A 15 (1.1 %) 4D 6 (0.3 %) 4S
4/3/2 19 (0.5 %) 3A 15 (1.1 %) 4D 11 (0.5 %) 4S
4/3/3 43 (1.1 %) 3A 24 (1.8 %) 4D 38 (1.6 %) 4S
4/3/4 138 (3.4 %) 3A 18 (1.3 %) 4D 58 (2.5 %) 4S
4/4/1 1 (0 %) 3A 17 (1.3 %) 4D 8 (0.3 %) 5S
4/4/2 1 (0 %) 3A 8 (0.6 %) 4D 28 (1.2 %) 5S
4/4/3 38 (0.9 %) 3A 13 (1 %) 4D 68 (2.9 %) 5S
4/4/4 116 (2.9 %) 3A 20 (1.5 %) 4D 132 (5.6 %) 5S
  1. aDay-Types are represented by the level of O3, NO2 and PM2.5 respectively
  2. bThe seven terminal nodes from the Atlanta tree are designated as 1A – 7A
  3. cThe six terminal nodes from the Dallas tree are designated as 1D – 6D
  4. dThe seven terminal nodes from the St. Louis tree are designated as 1S – 7S