Table 4.

Regression results for IAD and PDD prevalence for those born prior to 1985

Disease	Latitudes	Adjusted r2, F, p
IAD	Effective	0.63, 16, 0.004
	Actual	0.42, 7.4, 0.03
PDD	Effective	0.59, 9.5, 0.03
	Actual	0.23, 2.8, 0.15
PDD-IAD	Effective	−0.25, 0.01, 0.91
	Actual	−0.21, 0.12, 0.75