Table 6.

Standardized mean differences between one group and the other two combined for the North American ecoregion

Variable	Unadjusted			Adjusted for the GPS
	[1.77, 2.35]	[2.35, 2.69]	[2.69, 3.80]	[1.77, 2.35]	[2.35, 2.69]	[2.69, 3.80]
ELEV	1.24	− 1.95	− 0.71	0.74	− 2.57	0.14
Longitude	0.35	− 0.64	− 0.30	0.77	− 0.57	− 0.95
Log(PRECIP)	2.82	0.27	3.10	0.79	0.52	2.28
Log(AREA)	− 1.23	2.17	0.93	− 0.62	1.99	1.95
Log(CL)	− 3.75	1.30	− 2.23	− 2.35	1.53	− 1.89
Log(HCO3)	− 0.65	− 0.71	− 1.37	1.08	− 1.05	− 0.89
Log(SO4)	− 1.66	0.87	− 0.75	0.59	1.31	− 1.17
SED	− 1.21	− 0.67	− 1.90	− 1.49	− 0.23	− 1.66
STRMTEMP	− 2.69	2.35	− 0.27	− 2.03	1.71	1.38
Percent.AGT	− 0.89	− 1.35	− 2.29	− 0.43	− 1.59	− 3.11
Percent.URB	− 0.94	1.11	0.19	− 0.61	2.55	− 0.73
Percent.Canopy	− 1.11	− 0.31	− 1.43	− 0.72	− 0.66	− 1.05
Riparian.Disturb	− 1.02	0.22	− 0.79	0.72	0.57	0.56

See Table 3 caption for explanation