Table 2 Prevalence of ever asthma and current asthma by geographic exposure metrics among study participants in the Mountain Air Project study (2016–2017)

Road miles/sq. mi

 Tertile 1 (0.19–1.89)

49

–-

29

–-

 Tertile 2 (2.18–2.76)

75

1.03–1.96

59

1.24–2.86

 Tertile 3 (2.96–6.00)

94

1.27–2.35

69

1.43–3.22

Coal haul miles/sq. mi

  Zero

66

–-

50

–-

  Below median (0.00–0.62)

108

0.78–1.34

81

0.73–1.40

 Above median (0.72–1.27)

44

0.80–1.56

26

0.56–1.35

Oil/gas wells/sq. mi

 Zero

50

–-

32

–-

 Below median (0.34–3.51)

132

0.81–1.45

96

0.87–1.82

 Above median (4.38–8.44)

36

0.88–1.85

27

0.94–2.39

Abandoned mining, %HUC area

 Tertile 1 (0.00–8.04)

65

–-

45

–-

 Tertile 2 (9.72–44.84)

77

0.78–1.40

53

0.72–1.49

 Tertile 3 (46.40–196.45)

76

0.87–1.55

59

0.91–1.85

Active mining, %HUC area

 Zero

113

–-

84

–-

 Below median (0.00–8.02)

70

0.70–1.18

50

0.63–1.20

 Above median (9.68–48.31)

35

0.46–0.92

23

0.37–0.89