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Table 3

Logistic regression summary for predicting bottled water use on-campus (n = 3,177)

PredictorBetaStandard errorsOdd ratios95% Confidence intervalWald statisticp
Female 0.15 0.08 1.16 [0.99, 1.37] 3.16 0.075 
Age 0.02 0.01 1.02 [1.01, 1.04] 8.52 0.004 
Origin from West Virginia 0.53 0.09 1.70 [1.44, 2.00] 38.88 <0.001 
Student type (control Freshmen)     61.66 <0.001 
 Sophomore −0.57 0.14 0.57 [0.43, 0.75] 16.26 <0.001 
 Junior −0.63 0.14 0.53 [0.41, 0.70] 20.50 <0.001 
 Senior −0.76 0.14 0.47 [0.36, 0.62] 30.38 <0.001 
 Graduate or professional −1.12 0.14 0.33 [0.25, 0.43] 60.68 <0.001 
Organoleptic perceptions −0.34 0.06 0.64 [0.63, 0.80] 33.82 <0.001 
Perceived health risks 0.23 0.07 1.26 [1.09, 1.45] 9.81 0.002 
Environmental concern (squared) −0.05 0.01 0.95 [0.94, 0.97] 49.71 <0.001 
Trust in EPA −0.01 0.01 1.00 [0.99, 1.02] 0.19 0.667 
Trust in US government 0.01 0.01 1.00 [0.99, 1.02] 0.06 0.811 
Unfiltered tap water use at home −1.49 0.12 0.23 [0.18, 0.29] 159.30 <0.001 
Pseudo R2 (Nagelkerke) 0.213 
PredictorBetaStandard errorsOdd ratios95% Confidence intervalWald statisticp
Female 0.15 0.08 1.16 [0.99, 1.37] 3.16 0.075 
Age 0.02 0.01 1.02 [1.01, 1.04] 8.52 0.004 
Origin from West Virginia 0.53 0.09 1.70 [1.44, 2.00] 38.88 <0.001 
Student type (control Freshmen)     61.66 <0.001 
 Sophomore −0.57 0.14 0.57 [0.43, 0.75] 16.26 <0.001 
 Junior −0.63 0.14 0.53 [0.41, 0.70] 20.50 <0.001 
 Senior −0.76 0.14 0.47 [0.36, 0.62] 30.38 <0.001 
 Graduate or professional −1.12 0.14 0.33 [0.25, 0.43] 60.68 <0.001 
Organoleptic perceptions −0.34 0.06 0.64 [0.63, 0.80] 33.82 <0.001 
Perceived health risks 0.23 0.07 1.26 [1.09, 1.45] 9.81 0.002 
Environmental concern (squared) −0.05 0.01 0.95 [0.94, 0.97] 49.71 <0.001 
Trust in EPA −0.01 0.01 1.00 [0.99, 1.02] 0.19 0.667 
Trust in US government 0.01 0.01 1.00 [0.99, 1.02] 0.06 0.811 
Unfiltered tap water use at home −1.49 0.12 0.23 [0.18, 0.29] 159.30 <0.001 
Pseudo R2 (Nagelkerke) 0.213 
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