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Table 4

Multivariate Tobit regression model estimates for GM fecal coliform concentrations

Raw model
Exponentiated model
EstimateStandard error95% CIaEstimate95% CIp-value
Intercept 0.782 0.101 0.58–0.98 6.05 3.84–9.55  
UV deficiencyb 2.09 0.276 1.55–2.63 123 35.5–428 <0.001 
Other deficiencyc 0.172 0.187 −0.20–0.54 1.48 0.64–3.46 0.359 
Raw model
Exponentiated model
EstimateStandard error95% CIaEstimate95% CIp-value
Intercept 0.782 0.101 0.58–0.98 6.05 3.84–9.55  
UV deficiencyb 2.09 0.276 1.55–2.63 123 35.5–428 <0.001 
Other deficiencyc 0.172 0.187 −0.20–0.54 1.48 0.64–3.46 0.359 

a95% confidence interval.

bUV bulb off or OSS flow bypassing the UVD unit.

cDeficiency in OSS component other than UVD unit. Includes aerator malfunction, overdue pumping, and lack of electrical power to the OSS.

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