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. 2008 May 14;3(5):e2157. doi: 10.1371/journal.pone.0002157

Table 4. Multiple regression of environmental parameters significantly correlated with relative C. riparius frequencies (forward selection).

variable β b p
Prec Wettest Month (July) 2.60 34.90 0.007
Mean Prec Wettest Quarter (May–July) 2.18 36.33 0.020
CaCO3 −0.69 −0.60 0.102
Conductivity 0.47 0.89 0.225
Nitrite −0.20 −1.78 0.309

The regression was significant (N = 18, F(5,12) = 6.7, p = 0.003, corr. r2 = 0.63).