Different neighborhood walkability indexes for active commuting to school are necessary for urban and rural children and adolescents

Table 3 Performance of regression models between walkability index and ACS for the whole sample, controlling for gender, age, and SES

No. variables	Walkability index^a	MSE	RMSE	r-value
2	[N° crossings + Distance to school]	9.91	3.15	0.46
3	[N° crossings + Distance to school + Positive streetscape characteristics]	9.8	3.13	0.47
4	[Positive streetscape characteristics + Distance to school + No. traffic lanes + Crossing quality]	9.77	3.12	0.48
5	[Residential density + Distance to school +No. traffic lanes + Intersection density + Positive Streetscape characteristics]	9.69	3.11	0.48
6	[Residential density + Distance to school + No. traffic lanes + Crossing quality + Positive Streetscape characteristics + Intersection density]	9.69	3.11	0.48

Notes. Normalized values (range normalization) of the variables were used. MSE Mean square error, RMSE Root mean square error. ^aThe value of the variables Distance to school and No. traffic lanes have been inverted according to the Beta values found in Table 2

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