The involvement in fights (yes/no) was the dependent variable and the independent variables were categorized as follows: age (under 40 yrs./over 40 yrs.), marital status (married/single), social class (white collar/blue collar), and regular risky drinking (RSOD at least once a week/less often/none).
Risky drinking was defined as consuming at least 75 grams of pure alcohol on a drinking occasion and categorized into risky single occasion drinking at least once a week, less frequent RSOD, and no RSOD, and a category of abstainers was included for assaults.
For the college student population, reported involvement in fights was three times more likely among those who engaged in regular risky drinking (RSOD at least once a week), twice as likely for males, and for those who were younger (under 24 years).
Even more complicated is the association of outcomes for which it has become clear that the interrelation between mean consumption (volume) and RSOD plays a role.
A typical question for such risky single occasion drinking (RSOD) measures may read: "How often in the past 12 months did you have five or more drinks in the course of a day?" The usual frequency and the frequency of drinking (e.g., 5+) are most easily combined to derive overall volume if the recall period and frequency categories are the same for both questions (see, e.g., Dawson, 1998, to combine the QF with RSOD).
If RSOD (e.g., 5+ drinking) is to be included, the estimation of volume depends on the decision of whether these occasions are assumed to be extra occasions compared with the usual frequency or form part of the usual frequency (see above).