Table 7.

Slope estimates, standard error (SE), p-values, and variance inflation factor (VIF) for an eight-predictor variable model for predicting the natural log of struvite relative supersaturation.

Variable	Slope estimates	Standard errors (SE)	p-value	Variance inflation factor (VIF)
Intercept	−21.1	0.37	<0.001	0
pH	2.87	0.05	<0.001	1.35
Ammonium	6.26	0.61	<0.001	3.11
Chloride	0.97	0.27	<0.001	1.22
Calcium	69.1	29.1	0.018	1.20
Phosphorus	10.4	1.22	<0.001	1.29
Magnesium	301	15.2	<0.001	1.88
Citrate	−89.2	7.62	<0.001	1.54
Sulfate	−4.16	1.15	<0.001	3.04