Table 3.

Unadjusted mean BMI z-scores within tertile of environmental exposure, with tests for trend

		Mean BMI z-score per exposure tertile (Pearson’s correlation co-efficient)
	Tertile	Home	School	Modelled journey	Actual journey
All food outlets	1 (least exposed)	0.606	1.031	0.852	0.811
	2	0.710	0.592	0.700	0.979
	3	1.157 (0.208)**	1.018 (−0.081)	0.863 (−0.053)	0.671 (−0.104)
Takeaway food outlets	1 (least exposed)	0.722	1.031	0.924	0.737
	2	0.590	0.592	0.613	0.877
	3	1.161 (0.207)**	1.018 (−0.091)	0.790 (−0.060)	0.851 (−0.142)
Physical activity facilities	1 (least exposed)	0.593	1.179	0.721	0.551
	2	0.903	0.324	1.061 (0.052)	0.727
	3	0.967 (0.177)*	0.681 (−0.140)	-	1.197 (0.104)
Green space	1 (least exposed)	0.982	0.506	1.012	0.930
	2	0.651	0.681	0.761	0.859
	3	0.828 (−0.068)	1.379 (0.291)***	0.690 (−0.024)	0.676 (−0.131)
Density of fatal road traffic accidents	1 (least exposed)	0.836	0.926	0.795	0.570
	2	0.763 (−0.084)	0.681 (−0.094)	0.885 (−0.122)	0.857
	3	-	-	-	1.038 (−0.020)
Proportion of roads that are major roads	1 (most walkable)	0.655	0.640	0.765	0.862
	2	1.306	0.976	0.617	0.557
	3	0.952 (0.094)	0.747 (0.095)	1.085 (0.126)	1.056 (0.062)
Effective walkable area/Route length ratio (for journeys)	1 (least walkable)	0.548	1.379	1.066	0.773
	2	0.808	0.681	0.663	0.850
	3	1.110 (0.180)*	0.506 (−0.289)***	0.743 (−0.083)	0.842 (0.071)
Connected node ratio	1 (least connected)	0.655	1.031	-	-
	2	0.905	0.681	-	-
	3	0.912 (0.027)	0.843 (−0.059)	-	-
Herfindahl-Hirschmann Index	1 (least mixed)	0.559	1.031	0.554	0.506
	2	0.886	0.976	1.055	1.064
	3	1.020 (0.175)*	0.413 (−0.171)*	0.849 (0.113)	0.888 (0.113)

***p < 0.01, **p < 0.05, *p < 0.1, with reference to test for trend (Pearson’s correlation analysis) between environmental exposure and BMI z-score.