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Table 2 Descriptive statistics of endotoxin and air pollutant exposures by region

From: Personal endotoxin exposure in a panel study of school children with asthma

  Riverside Whittier
Exposure N1 Mean (SD) Median IQR. Min/Max N1 Mean (SD) Median IQR. Min/Max
Endotoxin (EU/m3)           
   Personal 94 2.30 (3.88) 1.01 2.25 0.003/20.6 282 1.92 (3.67) 0.48 1.97 0.002/25.3
   Indoor 31 0.58 (0.42) 0.43 0.68 0.063/1.72 78 1.49 (1.29) 1.10 0.86 0.13/7.5
   Outdoor 35 1.46 (1.67) 0.78 1.5 0.12/7.90 76 0.85 (1.18) 0.55 0.89 0.11/9.5
   Ambient 34 1.26 (1.17) 0.73 0.88 0.30/4.56 63 0.55 (0.45) 0.45 0.46 0.048/2.51
Personal Air Pollution and Weather           
   PM2.5 (μg/m3) 103 30.9 (20.1) 24.7 26.8 6.6/98.4 299 36.4 (26.8) 29.1 21.9 7.6/220.0
   EC (μg/m3) 132 0.43 (0.61) 0.39 0.32 0.04/6.94 295 0.76 (1.32) 0.47 0.82 0.001/17.2
   OC (μg/m3) 132 5.95 (2.62) 5.63 3.48 1.94/16.1 301 6.83 (3.41) 6.43 4.05 2.18/31.5
   NO2 (ppb) 147 23.3 (9.3) 23.4 12.7 5.16/47.6 313 30.6 (14.4) 28.4 18.9 2.7/105.7
   Temperature (°C) 147 26.8 (2) 27.2 3.1 22.8/32.1 313 24.8 (2.7) 25.4 3.5 17.3/30.5
   Relative Humidity (%) 147 43.9 (8.7) 40.6 14.8 28.6/64.0 312 49.8 (7.0) 50.4 7.75 25.2/66.6
Indoor Air Pollution and Weather           
   PM2.5 (μg/m3) 38 14.9 (8.4) 8.5 14.6 5.1/33.8 77 17.4 (10.6) 16.5 8.35 3.59/83.2
   EC (μg/m3) 37 0.71 (0.30) 0.56 0.41 0.17/1.3 79 0.80 (0.92) 0.62 0.54 0.14/7.75
   OC (μg/m3) 37 6.2 (1.82) 5.46 2.74 3.17/11.6 79 5.95 (2.37) 5.30 2.27 2.64/13.5
   Temperature (°C) 40 28.7 (1.7) 29.3 2.2 24.6/31.7 75 25.6 (2.87) 25.8 3.52 19.8/33.8
   Relative Humidity (%) 40 30.2 (10.3) 24.6 13.9 16.7/50.6 75 49.2 (7.21) 51.0 8.16 32.3/62.1
Outdoor Air Polution           
   PM2.5 (μg/m3) 38 27.0 (18.6) 15.6 19.4 9.3/71.8 77 19.3 (13.5) 16.4 8.46 3.18/84.3
   EC (μg/m3) 38 1.10 (0.36) 1.07 0.43 0.50/2.08 79 0.99 (1.41) 0.71 0.62 0.21/12.5
   OC (μg/m3) 38 6.21 (1.26) 6.07 1.57 3.78/9.66 79 4.54 (1.89) 4.24 2.63 2.05/10.3
Ambient Air Pollution and Weather           
   PM2.5 (μg/m3) 40 31.5 (22.1) 17.4 30.1 9.5/87.2 76 17.8 (12.0) 16.0 8.85 2.77/77.1
   EC (μg/m3) 35 1.55 (0.71) 1.30 0.86 0.52/3.64 76 0.69 (0.44) 0.59 0.45 0.14/2.95
   OC (μg/m3) 35 6.7 (1.69) 6.07 1.91 4.11/11.6 76 3.89 (1.49) 3.73 2.07 1.64/8.8
   NO2 (ppb) 40 26.8 (9.9) 26.2 12.3 11.6/54.8 79 27.7 (10.8) 26.0 11.6 12.0/74.1
   O3 (ppb) 40 77.9 (19.7) 74.5 25.9 33.4/120.8 79 40.7 (14.1) 38.9 18.5 11.1/79.2
   Temperature (°C) 40 24.4 (3.6) 25.4 6.05 17.3/30.1 79 20.7 (3.59) 21.2 5.5 11.7/27.8
   Relative Humidity (%) 40 27.4 (16.2) 23.0 29 2.0/61.0 79 39.7 (9.64) 42.0 12.0 6.0/61.0
  1. 1This is a repeated measures study so the N refers to the number of exposure measurements, not subjects.