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. Author manuscript; available in PMC: 2018 Oct 1.

Published in final edited form as: Environ Int. 2017 Jul 20;107:140–146. doi: 10.1016/j.envint.2017.07.010

Table 1.

Adjusted associations of childhood autism with green space metrics and road density.

Explanatory variables (unit)	Negative binomial model				Spatial lag model
Explanatory variables (unit)	RR^a	95% CIs	p		RR^a	95% CIs	p
Urban land (10%)	1.08	1.06 – 1.10	<0.001		1.12	1.08 – 1.17	<0.001
Forest (10%)	1.01	0.98 – 1.04	0.548		0.99	0.95 – 1.02	0.463
Grassland (10%)	0.95	0.92 – 0.99	0.008		0.96	0.92 – 1.00	0.058
Tree cover canopy (10%)	1.00	0.97 – 1.04	0.864		0.98	0.94 – 1.02	0.428
Near–road tree canopy, 50 m (10%)	1.01	0.96 – 1.07	0.582		0.99	0.94 – 1.05	0.778
Road density (1 km/1 km²)	1.19	1.12 – 1.27	<0.001		1.25	1.013 – 1.039	<0.001

^a:

adjusted for economic status (median household income), race (proportion of white population) and gender (proportion of male population).