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Table 3 Comparison of external factors in BMVCs resulting in severe or non-severe injuries to youth bicyclists

From: Child and adolescent bicycling injuries involving motor vehicle collisions

Environmental Factors

Collision resulting in severe injuries (%)

Collision resulting in non-severe injuries (%)

Unadjusted odds ratio (95% CI)

Adjusted odds ratiob (95% CI)

Adjusted odds ratioc (95% CI)

 

n = 43

n = 380

   

Driving Conditions

 Normal

42 (97.7)

357 (93.9)

1.00

1.00

1.00

 Poor

1 (2.3)

23 (6.1)

0.37 (0.05–2.81)

0.38 (0.05–3.00)

0.40 (0.05–3.26)

Intersection

 Yes

26 (60.5)

252 (66.3)

0.77 (0.41–1.48)

1.27 (0.50–3.21)

1.38 (0.55–3.54)

 No

17 (39.5)

128 (33.7)

1.00

1.00

1.00

Peak Traffic Timea

 Yes

6 (14.0)

114 (30.1)

0.38 (0.15–0.91)

0.37 (0.15–0.91)

0.40 (0.16–0.99)

 No

37 (86.0)

264 (69.9)

1.00

1.00

1.00

 Unknown

0 (0.0)

2 (4.7)

Road Type

 Divided w/ Barrier

19 (44.2)

138 (36.3)

1.00

1.00

1.00

 Divided No Barrier

6 (14.0)

112 (29.5)

0.39 (0.15–1.01)

0.37 (0.14–0.99)

0.36 (0.13–0.97)

 Undivided Two-Way

8 (18.6)

66 (17.4)

0.88 (0.70–2.12)

0.72 (0.25–2.15)

0.63 (0.20–1.95)

 Undivided One-Way

2 (4.7)

8 (2.1)

1.82 (0.39–9.19)

1.73 (0.31–9.53)

1.89 (0.34–10.55)

 Other

8 (18.6)

56 (14.7)

1.04 (0.43–2.51)

0.80 (0.23–2.74)

0.70 (0.20–2.48)

Traffic Control Device

 Nothing Present

21 (48.8)

156 (41.1)

1.00

1.00

1.00

 Crosswalk

10 (23.2)

59 (15.5)

1.26 (0.56–2.83)

1.13 (0.41–3.18)

1.13 (0.39–3.25)

 Traffic Lights

7 (16.3)

95 (25.0)

0.55 (0.22–1.34)

0.46 (0.14–1.46)

0.45 (0.14–1.49)

 Sign Present

3 (7.0)

62 (16.3)

0.36 (0.10–1.25)

0.34 (0.08–1.39)

0.32 (0.08–1.34)

 Unknown/Other

2 (4.7)

8 (2.1)

1.86 (0.37–9.34)

1.50 (0.27–8.34)

1.73 (0.29–10.38)

Hit and Run

 Yes

3 (7.0)

52 (13.7)

0.47 (0.14–1.59)

 No

40 (93.0)

328 (86.3)

1.00

Light Condition

 Normal

39 (89.5)

340 (89.5)

1.00

 Poor (Sunglare/Darkness)

4 (10.5)

34 (8.9)

1.02 (0.35–3.04)

 Unknown

0 (0.0)

6 (1.6)

Road Curve

 Straight

21 (48.8)

155 (40.8)

1.00

 Curved

5 (11.6)

17 (4.5)

2.17 (0.73–6.50)

 Unknown

17 (39.5)

208 (54.7)

   

Road Grade

 Flat

25 (58.1)

157 (41.3)

1.00

 Graded

1 (2.3)

16 (4.2)

0.39 (0.05–3.09)

 Unknown

17 (39.5)

207 (54.5)

0.52 (0.27–0.98)

Weekend

 Yes

15 (34.9)

83 (21.8)

1.91 (0.98–3.74)

 No

28 (65.1)

296 (77.9)

1.00

 Unknown

0 (0.0)

1 (0.3)

  1. bold indicates significant at 0.05 alpha level
  2. CI confidence interval
  3. aPeak traffic time defined as 6:00 am-8:59 am or 4 pm-5:59 pm on weekdays
  4. bAdjusted for Driving Conditions, Intersection, Peak Time, Road Type and Traffic Control Device
  5. cAdjusted for variables in bas well as cyclist age and sex