Table 2

Percentage +/- standard errors (absolute counts of students by mode of transport/total students) of K-5th grade students transported to school by car, walking, or school bus.*, §

Baseline

1-month

6-month

12-month


By car

Intervention

47 +/- 3

(132/281)

36 +/- 3

(106/291)

36 +/- 3

(116/323)

34 +/- 3

(102/303)

Controls

41 +/- 3

(152/372)

38 +/- 2

(169/447)

41 +/- 2

(168/406)

39 +/- 3

(134/340)


By walking

Intervention

20 +/- 2

(56/281)

25 +/- 3

(73/291)

24 +/- 2

(79/323)

25 +/- 2

(75/303)

Controls

15 +/- 2

(54/372)

11 +/- 2

(51/447)

11 +/- 2

(45/406)

7 +/- 1

(24/340)


By school bus

Intervention

31 +/- 3

(88/281)

36 +/- 3

(105/291)

37 +/- 3

(119/323)

39 +/- 3

(118/303)

Controls

40 +/- 3

(149/372)

45 +/- 2

(200/447)

44 +/- 2

(177/406)

49 +/- 3

(165/340)


* Unless otherwise indicated, differences were not significant using a Pearson Chi-squared test comparing intervention versus controls at the specified time point for each mode of transport. P-values were adjusted using the Ryan-Holm stepdown Bonferroni procedure.

§Other forms of school transport (metro bus and bicycle) were excluded from the table due to low percentages.

p = 0.0012 at 1-month, p = 0.0011 at 6-months, and p = 0.001 at 12-months for differences between intervention versus controls.

Mendoza et al. BMC Public Health 2009 9:122   doi:10.1186/1471-2458-9-122

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