|
Continuous variables (quartiles)
|
Mean birth weight (SD)
|
Small for gestational age N (%)
|
Preterm birth N (%)
|
Comparison group (≥ 37 weeks; ≥ 2500 grams) N (%)
|
|---|
|
Cumulative traffic density/1000 (vehicles-km)
| | | | | | | | |
|
≤ 261.0
|
3469
|
(539)
|
9441
|
22.4
|
7187
|
21.7
|
89628
|
25.6
|
|
> 261.0 – 704.6
|
3427
|
(526)
|
10398
|
24.7
|
8105
|
24.4
|
87756
|
25.0
|
|
> 704.6 – 1602.0
|
3398
|
(564)
|
10944
|
26.0
|
8628
|
26.0
|
86674
|
24.7
|
|
> 1602.0
|
3368
|
(569)
|
11256
|
26.7
|
9207
|
27.7
|
85785
|
24.5
|
|
Missing (688)
|
3413
|
(560)
|
70
|
0.2
|
57
|
0.2
|
561
|
0.2
|
|
Distance to primary highways (meters)
| | | | | | | | |
|
≤ 1107
|
3398
|
(555)
|
11067
|
26.3
|
8460
|
25.5
|
86888
|
24.8
|
|
> 1107 – 2150
|
3403
|
(565)
|
10741
|
25.5
|
8496
|
25.6
|
87196
|
24.9
|
|
> 2150 – 3745
|
3413
|
(563)
|
10482
|
24.9
|
8422
|
25.4
|
87529
|
25.0
|
|
> 3750
|
3448
|
(554)
|
9819
|
23.3
|
7806
|
23.5
|
88791
|
25.3
|
|
% land use for recreation and conservation (open space)
| | | | | | | | |
|
≤ 4.0
|
3363
|
(568)
|
11184
|
26.6
|
8905
|
26.8
|
81668
|
23.3
|
|
> 4.0 – 9.4
|
3403
|
(567)
|
10861
|
25.8
|
8711
|
26.3
|
86966
|
24.8
|
|
> 9.4 – 17.8
|
3447
|
(547)
|
9658
|
22.9
|
7182
|
21.6
|
85787
|
24.5
|
|
> 17.8
|
3458
|
(546)
|
9210
|
21.9
|
7328
|
22.1
|
87770
|
25.0
|
|
Missing (10470)
|
3319
|
(597)
|
1196
|
2.8
|
1058
|
3.2
|
8213
|
2.3
|
|
Median household income (in US $)
| | | | | | | | |
|
≤ 46336
|
3303
|
(581)
|
12853
|
30.5
|
10736
|
32.4
|
83081
|
23.7
|
|
> 46336 – 62773
|
3406
|
(564)
|
10984
|
26.1
|
8405
|
25.3
|
86917
|
24.8
|
|
> 62773 – 78583
|
3467
|
(547)
|
9778
|
23.2
|
7253
|
21.9
|
89304
|
25.5
|
|
> 78583
|
3486
|
(526)
|
8494
|
20.2
|
6790
|
20.5
|
91102
|
26.0
|
- N – number; SD – standard deviation
