TABLE 3

Logit models examining relationship between E. coli isolate biochemical assay results and isolation source

Model parameterValue by isolate comparisona
Enteric vs environmentalEnteric vs soil
CoefficientPr(>|Z|)CoefficientPr(>|Z|)
Intercept−0.610.58−0.560.65
Arginine dihydrolase6.20.76
Lysine decarboxylase−0.120.77−0.280.56
Indole production−0.840.32−0.960.31
Inositol−1.20.36−7.20.78
Sorbitol0.300.470.170.72
Rhamnose0.900.03*0.590.23
Sucrose−0.520.08−0.770.02*
Melibiose1.60.01*1.70.03*
n281186
Pseudo-R20.0850.104
P0.0240.034
• a An asterisk denotes results statistically significant at α < 0.05. The dash denotes the exclusion of the arginine dihydrolase parameter in the enteric versus soil model due to lack of variation. Pr(>|Z|) refers to the probability that the coefficient is not zero as calculated using the Z test.