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Table 1 Baseline characteristics of the participants in Auckland vs. the rest of New Zealand

From: The role of multilevel factors in geographic differences in bicycle crash risk: a prospective cohort study

Baseline characteristics

 

Auckland (N = 919)

Others (N = 1635)

P-value

    

Crude

Adjusted

Age

Mean (SD)

43.8 (10.6)

44.1 (10.3)

0.5

 

Male

%

73.5

71.8

0.4

 

Māori

%

2.5

5.0

0.003

 

Education

     

High school (secondary) or less

%

17.6

22.1

0.007

0.01a

Polytechnic

%

20.2

28.0

<0.0001

<0.0001a

University

%

61.9

49.6

<0.0001

<0.0001a

Missing

%

0.2

0.2

  

Body mass index

Mean (SD)

25.2 (3.3)

25.4 (3.8)

0.1

0.3a

Missing

%

0.7

0.6

  

NZDep 2006 score

     

1–3

%

57.1

46.9

<0.0001

<0.0001b

4–7

%

32.9

37.7

0.01

0.03b

8–10

%

10.0

15.4

0.0001

0.0002b

Main urban area

%

95.5

69.4

<0.0001

<0.0001b

Years of cycling

Mean (SD)

6.4 (8.3)

7.2 (9.2)

0.02

0.006c

 

Median (IQR)

3.0 (7.0)

3.0 (8.5)

  

Missing

%

0.7

0.3

  

Time spent cycling (hours per week)

Mean (SD)

5.8 (3.6)

5.7 (3.8)

0.3

0.4c

 

Median (IQR)

5.0 (4.5)

5.0 (5.0)

  

Missing

%

0.2

0.4

  

% cycling off-road

Mean (SD)

5.8 (14.8)

9.8 (19.6)

<0.0001

<0.0001c

 

Median (IQR)

0.0 (5.0)

0.0 (10.0)

  

Missing

%

0.4

0.6

  

% cycling in the dark

Mean (SD)

11.7 (16.4)

7.5 (12.0)

<0.0001

<0.0001c

 

Median (IQR)

5.0 (20.0)

1.0 (10.0)

  

Missing

%

0.2

0.2

  

% cycling in a bunch

Mean (SD)

23.7 (28.1)

17.2 (23.2)

<0.0001

<0.0001c

 

Median (IQR)

10.0 (45.0)

5.0 (25.0)

  

Missing

%

0.8

0.8

  

Cycle to work at least once a week

%

26.7

31.3

0.05

<0.0001c

Missing

%

1.9

1.9

  

Mainly use road bike

%

89.5

85.0

0.001

0.0007c

Missing

%

0.4

0.5

  

Crash in the past 12 months

%

32.5

29.9

0.2

0.9c

Missing

%

0.2

0.2

  

Always wear helmet

%

98.6

98.7

1

0.5d

Missing

%

0.4

0.4

  

Wear fluorescent colours

     

Always

%

29.8

28.8

0.6

0.2d

Sometimes

%

49.5

51.3

0.4

0.4d

Never

%

19.7

19.1

0.7

0.7d

Missing

%

1.0

0.7

  

Always use lights in the darke

%

85.4

80.8

0.02

0.6d

Missing

%

0.1

0.0

  

Use reflective materials in the darke

     

Always

%

44.9

51.7

0.006

0.02d

Sometimes

%

27.4

29.0

0.5

0.1d

Never

%

27.3

19.0

<0.0001

<0.0001d

Missing

%

0.5

0.3

  

Ever listen to music while riding

%

16.3

16.3

0.9

0.3d

Missing

%

0.8

0.4

  
  1. aAdjusted for age, gender and ethnicity.
  2. bAdjusted as above plus education and BMI.
  3. cAdjusted as above plus NZDep 2006 scores and urban residence.
  4. dAdjusted as above plus years of cycling, time spent cycling,% cycling off-road,% cycling in the dark,% cycling in a bunch, cycle to work, mainly use road bike and baseline crash history.
  5. eRestricted to 1708 participants who reported cycling in the dark.
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Environmental Health

ISSN: 1476-069X