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Table 3 Outdoor Air Samples - Proximal, Intermediate and Distal Homes

From: Airborne cow allergen, ammonia and particulate matter at homes vary with distance to industrial scale dairy operations: an exposure assessment

Analyte Home Type n(< LOD) mean sd median IQR max   p value*
Bos d 2 μg/m3 Proximal
Intermediate
Distal
19 (0)
6 (0)
12 (3)
0.77
0.28
0.028
0.56
0.44
0.026
0.66
0.17
0.011
0.79
0.1
0.03
1.87
0.292
0.096
P vs D
P vs I
D vs I
< 0.01
< 0.01
< 0.01
NH3 ppb Proximal
Intermediate
Distal
19 (0)
7 (1)
13 (6)
9.4
1.9
1.0
5.8
2.0
0.6
8.7
1.3
1.1
6.3
1.1
0.8
28.0
6.4
2.5
P vs D
P vs I
D vs I
< 0.01
< 0.01
0.24
TD μg/m3 Proximal
Intermediate
Distal
19 (0)
6 (0)
13 (0)
33
18
37
24
5
82
29
18
15
23
6
9
104
25
310
P vs D
P vs I
D vs I
0.02
0.09
0.38
  1. *Kruskal-Wallis
  2. P = proximal, D = distal and I = intermediate home types.