Table 5 Percent of population and mean time spent in microenvironments on workday/ weekday by distance to highway

0–50

16.26 (5.0)*

67%

0.89 (1.6)

4%

5.98 (5.6)****

25%

0.64 (1.2)

3%

0.23 (0.4)

<1%

51–150

17.56 (4.2)

73%

1.90 (2.6)

8%

3.19 (4.5)*

13%

1.13 (2.1)

5%

0.22 (0.5)

<1%

151–250

18.39 (4.3)*

77%

1.57 (2.3)

6%

2.11 (3.9)**

9%

1.65 (2.9)

7%

0.28 (0.6)

1%

251–450

17.58 (4.3)

73%

1.75 (2.8)

7%

2.94 (4.2)*

13%

1.43 (2.3)

6%

0.30 (0.5)

1%

>=1000

17.48 (4.6)

73%

1.46 (2.7)

6%

3.46 (4.6)**

14%

1.18 (1.9)

5%

0.42 (1.39)

2%

Non–workday /weekend

Inside home

Outside home

School/ work

Other

Highway

Distance (m)

Mean (SD)

%/Day

Mean (SD)

%/Day

Mean (SD)

%/Day

Mean (SD)

%/Day

Mean (SD)

%/Day

0–50m

18.36 (4.2)*

77%

2.88 (4.5)

12%

1.06 (2.4)

4%

1.28 (2.1)

5%

0.42 (0.7)

2%

51–150m

19.37 (3.1)

81%

2.35 (2.6)

10%

0.48 (1.8)*

2%

1.61 (2.6)

6%

0.18 (0.4)

<1%

151–250m

20.22 (2.9)*

84%

2.05 (2.4)

9%

0.15 (1.0)*

<1%

1.41 (2.3)

6%

0.18 (0.4)

<1%

251–450m

19.52 (3.7)

81%

1.83 (2.5)

8%

0.35 (1.7)

2%

1.97 (2.6)

8%

0.33 (0.7)

1%

>=1000m

18.94 (4.1)*

79%

1.93 (2.9)

8%

1.18 (3.7)**

5%

1.67 (2.4)

7%

0.28 (0.6)

1%