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Table 2 The mean and standard deviation of all confounding factors, the treatment log TN, and the response invertebrate richness within all streams and within the three strata

From: The effects of nutrients on stream invertebrates: a regional estimation by generalized propensity score

Variable Means ± standard deviation
All streams Forested Mountains Great Plains North American Deserts
Log(TN) 2.33 ± 0.51 2.04 ± 0.35 2.95 ± 0.36 2.64 ± 0.38
Invertebrate richness 48.30 ± 15.15 55.19 ± 12.58 33.72 ± 11.76 40.03 ± 11.49
ELEV 1252.06 ± 722.10 1455.84 ± 688.03 783.80 ± 379.71 1701.97 ± 501.16
Longitude − 114.04 ± 7.55 − 166.85 ± 5.48 − 102.06 ± 3.16 − 113.58 ± 4.06
Log(PRECIP) − 0.31 ± 0.56 − 0.07 ± 0.49 − 0.81 ± 0.18 − 0.74 ± 0.27
Log(AREA) 4.07 ± 2.34 3.09 ± 1.68 6.77 ± 1.73 4.53 ± 2.56
Log(CL) 4.35 ± 1.85 3.05 ± 1.20 6.04 ± 1.21 5.28 ± 1.73
Log(HCO3) 7.34 ± 1.12 6.76 ± 1.06 8.44 ± 0.55 7.75 ± 0.77
Log(SO4) 5.48 ± 2.42 3.97 ± 1.52 8.70 ± 1.61 6.42 ± 1.90
SED 35.45 ± 30.35 1.82 ± 8.95 12.79 ± 32.54 4.85 ± 20.45
STRMTEMP 15.16 ± 5.55 12.39 ± 4.19 20.58 ± 5.02 16.08 ± 5.70
Percent.AGT 8.10 ± 21.28 0.58 ± 5.59 38.72 ± 33.44 2.90 ± 9.58
Percent.URB 0.17 ± 0.47 0.06 ± 0.22 0.33 ± 0.44 0.13 ± 0.47
Percent.Canopy 0.37 ± 0.38 0.23 ± 0.31 0.72 ± 0.32 0.59 ± 0.39
Riparian.Disturb 0.56 ± 0.64 0.36 ± 0.57 1.10 ± 0.53 1.03 ± 0.56