| |
Farm equipment crash
|
|---|
| |
cOR (95% CI)a
|
aOR (95% CI)b
|
|---|
|
Road characteristics
|
|
Traffic volumec
|
|
0–30
|
Ref
|
Ref
|
|
31–101
|
1.93 (1.54–2.40)
|
2.00 (1.60–2.49)
|
|
102–360
|
1.69 (1.35–2.12)
|
3.76 (2.97–4.77)
|
|
361–1250
|
3.26 (2.66–4.00)
|
7.43 (5.90–9.34)
|
|
1251+
|
3.88 (3.17–4.74)
|
7.00 (5.38–8.85)
|
|
Speed limit (mph)d
|
|
< 35
|
Ref
|
Ref
|
|
35–45
|
3.59 (2.75–4.68)
|
3.03 (2.30–3.99)
|
|
50–60
|
4.64 (3.92–5.49)
|
8.05 (6.59–9.84)
|
|
65+
|
4.02 (2.87–5.64)
|
3.52 (2.42–5.14)
|
|
Road typee
|
|
Interstate
|
0.59 (0.26–1.31)
|
0.60 (0.27–1.35)
|
|
US route
|
4.53 (3.77–5.44)
|
4.86 (3.99–5.91)
|
|
Iowa route
|
5.70 (4.80–6.78)
|
5.98 (4.97–7.20)
|
|
FTM routef
|
4.70 (4.14–5.34)
|
4.67 (4.11–5.32)
|
|
Local route
|
Ref
|
Ref
|
|
Surface type
|
|
Paved
|
Ref
|
Ref
|
|
Unpaved
|
0.65 (0.58–0.73)
|
0.97 (0.86–1.11)
|
|
Road widthg
|
|
mean(sd)
|
0.95 (0.91–0.99)
|
0.90 (0.86–0.94)
|
|
Shoulder widthg
|
|
mean(sd)
|
1.44 (1.39–1.49)
|
0.94 (0.89–1.00)
|
-
aCrude odds ratios and 95% confidence intervals
-
bAdjusted odds ratios and 95% confidence intervals; bolded estimates were significant at the α=0.05 level.
-
cAverage Annual Daily Traffic (Total annual traffic volume/365)
-
dModel mutually controls for Speed Limit, Traffic Volume, and Shoulder Width
-
eModel mutually controls for Road Type, Surface Type and Road Width
-
fFarm to market route
-
gUnit: 5 feet
