Pilot evaluation of a walking school bus program in a low-income, urban community

BMC Public Health

Table 2 Percentage +/- standard errors (absolute counts of students by mode of transport/total students) of K-5^th 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.

ISSN: 1471-2458