Table 2.
Descriptive statistics for variables used in ROOM regression analysis
| Description or Coding Definition | Mean | SD | |
|---|---|---|---|
| College Behavior | |||
| Binge drinking: monthly episodes 1st fall | Count of five [four if female] or more drinks in a row in the fall semester of 1st year of college | 2.16 | 3.92 |
| Binge drinking: monthly episodes last fall | Same as above for past fall semester (fall 2007) | 2.14 | 3.83 |
| Drinking: monthly episodes 1st fall | Count of monthly drinking times in the fall semester of 1st year of college | 3.71 | 4.84 |
| Drinking: monthly episodes last fall | Same as above for past fall semester (fall 2007) | 3.75 | 4.90 |
| Pre-college or high school behavior† | |||
| Ego binge drinking | Binge drinking before college=1; otherwise=0 | 0.40 | 0.49 |
| Ego drinking | Drinking before college=1; otherwise=0 | 0.61 | 0.49 |
| Roommate binge drinking | Binge drinking before college=1; otherwise=0 | 0.40 | 0.49 |
| Roommate drinking | Drinking before college=1; otherwise=0 | 0.61 | o.49 |
| Controls | |||
| Ego family income | Respond’s reported parents’ or guardians’ total income in the 12 months before college | 4.63 | 2.00 |
| Ego Mom education | Highest level of formal education obtained by mother | 5.33 | 1.39 |
| Ego Dad education | Highest level of formal education obtained by father | 5.50 | 1.49 |
| Ego GPA | Self-reported GPA past fall semester (fall 2007) | 3.23 | 0.54 |
| Ego gender | Male | 0.38 | |
| Female | 0.62 | ||
| Ego race/ethnicity | Asian | 0.070 | |
| Hispanic | 0.058 | ||
| African | 0.122 | ||
| White | 0.659 | ||
| Other | 0.091 | ||
| Roommate family income | Respond’s reported parents’ or guardians’ total income in the 12 months before college | 4.62 | 2.00 |
| Roommate Mom education | Highest level of formal education obtained by mother | 5.32 | 1.39 |
| Roommate Dad education | Highest level of formal education obtained by father | 5.49 | 1.49 |
| Roommate GPA | Self-reported GPA past fall semester (fall 2007) | 3.23 | 0.54 |
| Roommate race/ethnicity | Asian | 0.069 | |
| Hispanic | 0.057 | ||
| African | 0.122 | ||
| White | 0.659 | ||
| Other | 0.092 | ||
| Building alcohol use | Average level of alcohol use in residence hall | 1.83 | 0.29 |
| Roommate a friend | Considering roommate best college friend | ||
| Strongly agree | 0.185 | ||
| Agree somewhat | 0.154 | ||
| Disagree somewhat | 0.210 | ||
| Strongly disagree | 0.449 | ||
| Fixed effects | |||
| Hall gender | Segregated co-ed | 0.86 | |
| Co-ed | 0.06 | ||
| All female | 0.04 | ||
| All male | 0.04 | ||
| Campus location | South campus | 0.26 | |
| North campus | 0.11 | ||
| Middle campus | 0.63 | ||
| Smoker status | Yes | 0.01 | |
| in housing form | No | 0.99 | |
| N | 1989–2070 | ||
†
Roommate’s descriptive statistics are the same as those of egos’