Table 3.
Logistic regression model results evaluating the influence of susceptibility and severity scales that constituted the risk perception scale on whether respondents reported boiling water.
| Model 4 | Model 5 | Model 6 | ||||
|---|---|---|---|---|---|---|
| − 2 log likelihood | 383.759 | 386.528 | 387.756 | |||
| r2 (Nagelkerke) | 0.209 | 0.205 | 0.201 | |||
| Chi-squared test (χ2) | 65.973 | 64.695 | 63.467 | |||
| Degrees of freedom (df) | 15 | 14 | 13 | |||
| p value | < 0.0005 | < 0.0005 | < 0.0005 | |||
| Sample size (N) | 492 | 496 | 496 |
| Predictor variables | OR (95% CI) | p value | OR (95% CI) | p value | OR (95% CI) | p value |
|---|---|---|---|---|---|---|
| Constant | 0.12 | 0.069 | 0.22 | 0.143 | 0.33 | 0.250 |
| Susceptibility | 0.83 (0.62,1.10) | 0.197 | 0.84 (0.64,1.11) | 0.226 | 0.81 (0.62,1.06) | 0.122 |
| Severity | 1.23 (0.86,1.77) | 0.258 | ||||
| Water quality perception | 1.19 (0.91,1.55) | 0.215 | 1.16 (0.89,1.52) | 0.266 | ||
| Perceived efficacy | 1.45 (0.88,2.39) | 0.145 | 1.59 (0.98,2.58) | 0.059 | 1.70 (1.07,2.71) | 0.025 |
| Minor in household | 1.75 (0.99,3.09) | 0.054 | 1.80 (1.02,3.18) | 0.042 | 1.77 (1.00,3.12) | 0.049 |
| Ability to boil water—none | < 0.0005 | < 0.0005 | < 0.0005 | |||
| Ability to boil water—likely some | 5.05 (2.6,9.77) | < 0.0005 | 4.74 (2.48,9.07) | < 0.0005 | 4.79 (2.50,9.14) | < 0.0005 |
| Ability to boil water—full | 3.03 (1.44,6.38) | 0.004 | 2.84 (1.36,5.93) | 0.006 | 2.87 (1.37,5.99) | 0.005 |
| Family income (Less than $35,00) | 0.027 | 0.028 | 0.020 | |||
| Family income ($35,000–$49,999) | 1.45 (0.83,2.55) | 0.194 | 1.47 (0.84,2.58) | 0.174 | 1.54 (0.89,2.68) | 0.126 |
| Family income ($50,000–$74,999) | 0.43 (0.24,0.77) | 0.005 | 0.44 (0.25,0.78) | 0.005 | 0.44 (0.25,0.78) | 0.005 |
| Family income (75,000–99,999) | 1.41 (0.71,2.79) | 0.326 | 1.37 (0.69,2.69) | 0.369 | 1.40 (0.71,2.76) | 0.33 |
| Family income ($100,000 or more) | 0.95 (0.49,1.86) | 0.882 | 0.98 (0.50,1.90) | 0.945 | 0.97 (0.5,1.87) | 0.915 |
| Race (White) | 0.074 | 0.063 | 0.069 | |||
| Race (Black or African American) | 0.41 (0.07,2.32) | 0.312 | 0.39 (0.07,2.09) | 0.271 | 0.39 (0.07,2.07) | 0.267 |
| Race (American Indian or Alaska Native) | 0.16 (0.04,0.66) | 0.011 | 0.16 (0.04,0.64) | 0.010 | 0.16 (0.04,0.64) | 0.010 |
| Race (Asian) | 191,763,424 | 0.999 | 178,532,594 | 0.999 | 199,567,944 | 0.999 |
| Race (two or more races) | 1.85 (0.56,6.18) | 0.315 | 1.83 (0.56,6.01) | 0.320 | 1.71 (0.52,5.6) | 0.377 |
OR Odds ratio, CI Confidence interval.