|
Variable
|
Fixed Facilities
|
Transportation
|
|---|
| |
No.
|
% with evac.
|
POR (95% CI)
|
No.
|
% with evac.
|
POR (95% CI)
|
|---|
|
Time of day
| | | | | | |
|
0000–0559
|
4130
|
6.5
|
referent
|
1237
|
4.9
|
referent
|
|
0600–1159
|
10188
|
10.4
|
1.67 (1.45–1.92)
|
3085
|
5.1
|
1.04 (0.77–1.41)
|
|
1200–1759
|
9363
|
10.2
|
1.64 (1.42–1.88)
|
2591
|
5.4
|
1.11 (0.82–1.51)
|
|
1800–2359
|
5100
|
10.5
|
1.69 (1.45–1.97)
|
1210
|
6.1
|
1.26 (0.89–1.78)
|
|
Day of week
| | | | | | |
|
Weekend
|
5790
|
5.0
|
referent
|
1262
|
7.7
|
referent
|
|
Weekday
|
24400
|
4.8
|
1.26 (1.14–1.40)
|
8170
|
8.8
|
0.95 (0.73–1.25)
|
|
Season
| | | | | | |
|
Dec.-Feb.
|
6683
|
9.2
|
referent
|
1682
|
5.4
|
referent
|
|
Mar.-May
|
8058
|
9.6
|
1.04 (0.93–1.17)
|
2860
|
4.6
|
0.86 (0.65–1.13)
|
|
Jun.-Aug.
|
8559
|
10.3
|
1.12 (1.01–1.25)
|
2849
|
4.7
|
0.87 (0.66–1.14)
|
|
Sep.-Nov
|
6890
|
10.1
|
1.10 (0.98–1.23)
|
2041
|
4.8
|
0.89 (0.67–1.20)
|
|
Area*
| | | | | | |
|
Industrial
|
18958
|
8.5
|
0.60 (0.48–0.75)
|
2579
|
5.7
|
0.61 (0.43–0.85)
|
|
Commercial
|
5438
|
5.2
|
3.11 (2.49–3.88)
|
3436
|
3.5
|
0.87 (0.63–1.19)
|
|
Residential
|
2158
|
22.3
|
1.50 (1.38–1.62)
|
637
|
5.0
|
1.12 (0.98–1.28)
|
|
Agricultural
|
2269
|
23.6
|
0.68 (0.51–0.89)
|
1681
|
7.9
|
0.86 (0.60–1.22)
|
|
Other
|
1089
|
5.9
|
referent
|
947
|
4.9
|
referent
|
|
Release Type
| | | | | | |
|
Spill
|
11129
|
6.9
|
referent
|
7999
|
3.1
|
referent
|
|
Air
|
17222
|
9.3
|
1.38 (1.27–1.51)
|
945
|
12.7
|
4.55 (3.61–5.72)
|
|
Fire
|
869
|
35.7
|
7.48 (6.40–8.75)
|
134
|
20.2
|
7.89 (5.08–12.25)
|
|
Explosion
|
242
|
36.8
|
7.85 (5.98–10.29)
|
10
|
20.0
|
7.81 (1.65–36.99)
|
|
Fire & explosion
|
96
|
46.9
|
11.90 (7.92–17.89)
|
4
|
25.0
|
10.42 (1.08–100.5)
|
|
Threatened
|
335
|
34.9
|
7.24 (5.72–9.17)
|
231
|
20.8
|
8.20 (5.82–11.54)
|
|
Substances†,‡
|
|
Acid
|
1850
|
9.6
|
1.46 (1.27–1.67)
|
NA
|
|
Ammonia
|
2144
|
24.6
|
3.44 (3.09–3.83)
|
290
|
18.3
|
4.89 (3.57–6.69)
|
|
Chlorine
|
599
|
33.1
|
4.79 (4.03–5.71)
|
22
|
27.3
|
7.52 (2.93–19.31)
|
|
Multiple substances§
|
1213
|
25.6
|
3.41 (2.98–3.90)
|
386
|
14.8
|
3.79 (2.81–5.10)
|
- *Type of general land use of the surrounding area in which the event occurred.
-
†Only substance categories with a 95% CI greater than 1.0 are presented.
-
‡ Substance categories were coded as yes/no. The referent group is all other substances.
-
§Events with more than one hazardous substance released from different chemical categories.
