Table 3.
ZINB regression results
| Variable | B | SEB | Z | Ratio | [95% CI] |
| Actual drinks at home | |||||
| Logistic portion of the model | |||||
| Gender | 0.329 | 0.179 | 1.83 | 1.390 | [0.977, 1.977] |
| Age | −0.687 | 0.088 | −7.76*** | 0.503 | [0.423, 0.598] |
| Perceived drinks at home | −0.417 | 0.064 | −6.49*** | 0.659 | [0.581, 0.747] |
| Counts portion of the model | |||||
| Gender | 0.093 | 0.069 | 1.34 | 1.097 | [0.958, 1.258] |
| Age | −0.027 | 0.022 | −1.26 | 0.972 | [0.933, 1.016] |
| Perceived drinks at home | 0.148 | 0.017 | 8.91*** | 1.160 | [1.123, 1.198] |
| Actual drinks at a non–fraternity/sorority party | |||||
| Logistic portion of the model | |||||
| Gender | 0.381 | 0.130 | 2.92** | 1.463 | [1.133, 1.889] |
| Age | −0.287 | 0.046 | −6.21*** | 0.750 | [0.685, 0.821] |
| Perceived drinks at a non–fraternity/sorority party | −0.282 | 0.032 | −8.77*** | 0.754 | [0.708, 0.803] |
| Counts portion of the model | |||||
| Gender | 0.145 | 0.035 | 4.16*** | 1.116 | [1.080, 1.237] |
| Age | −0.027 | 0.011 | −2.50** | 0.973 | [0.952, 0.994] |
| Perceived drinks at a non–fraternity/sorority party | 0.111 | 0.007 | 17.41*** | 1.117 | [1.103, 1.131] |
| Actual drinks at a fraternity/sorority party | |||||
| Logistic portion of the model | |||||
| Gender | 0.224 | 0.121 | 1.85 | 1.251 | [0.987, 1.586] |
| Age | 0.058 | 0.038 | 1.50 | 1.059 | [0.983, 1.142] |
| Perceived drinks at a fraternity/sorority party | −0.059 | 0.021 | −3.34*** | 1.251 | [0.896, 0.972] |
| Counts portion of the model | |||||
| Gender | 0.249 | 0.043 | 5.74*** | 1.282 | [1.178, 1.395] |
| Age | −0.025 | 0.015 | −1.70 | 0.975 | [0.947, 1.004] |
| Perceived drinks at a fraternity/sorority party | 0.094 | 0.007 | 13.50*** | 1.099 | [1.084, 1.115] |
| Actual drinks at a bar | |||||
| Logistic portion of the model | |||||
| Gender | 0.257 | 0.182 | 1.42 | 1.294 | [0.906, 1.848] |
| Age | −1.557 | 0.096 | −16.24*** | 0.209 | [0.173, 0.252] |
| Perceived drinks at a bar | −0.112 | 0.045 | −2.55* | 0.891 | [0.815, 0.974] |
| Counts portion of the model | |||||
| Gender | −0.073 | 0.055 | −1.32 | 0.929 | [0.834, 1.036] |
| Age | −0.008 | 0.020 | −0.39 | 0.992 | [0.955, 1.032] |
| Perceived drinks at a bar | 0.186 | 0.013 | 14.54*** | 1.204 | [1.175, 1.245] |
| Actual drinks at sporting events | |||||
| Logistic portion of the model | |||||
| Gender | 0.347 | 0.141 | 3.17** | 1.564 | [1.186,2.062] |
| Age | −0.462 | 0.051 | −9.09*** | 0.630 | [0.578, 0.696] |
| Perceived drinks at sporting events | −0.272 | 0.029 | −9.37*** | 0.762 | [0.719, 0.806] |
| Counts portion of the model | |||||
| Gender | 0.214 | 0.064 | 3.37*** | 1.239 | [1.093, 1.403] |
| Age | −0.073 | 0.020 | −3.58*** | 0.929 | [0.893, 0.967] |
| Perceived drinks at sporting events | 0.132 | 0.011 | 11.76*** | 1.11 | [1.116, 1.166] |
Notes: ZINB = zero-inflated negative binomial; ratio = zero-inflated odds ratios are presented for the logistic portion of the model and negative binomial incidence rate ratios are presented for the counts portion of the model.
*
p < .05;
**
p < .01;
***
p < .001.