Alcohol policy enforcement and changes in student drinking rates in a statewide public college system: a follow-up study

Table 2 Comparisons^a of 1999 and 2001 rates of student drinking and related behaviors at eleven Massachusetts public colleges/universities.

	1999 (N = 1252) % (95%CI)	2001^b (N = 1074) % (95%CI)	Chi-square, p-value
Any drinking in past 12 months	87.9 (84.7-91.1)	86.3 (81.3-91.3)	0.46, .515
Any drinking in past 30 days	75.5 (71.6-79.4)	70.4 (64.8-76.0)	8.35, .016
Heavy episodic drinking^c in past 2 weeks	54.9 (49.3-60.5)	50.6 (45.2-56.0)	5.67, .039
Usual heavy episodic drinking (among past-30-days drinkers)^d	67.1 (63.0-71.3)	56.8 (54.1-59.5)	16.27, .002
Heavy episodic drinking in past 2 weeks among those reporting no heavy drinking in high school (Uptake)	37.7 (32.7-42.7)	30.9 (24.0-37.8)	2.72, .130
Drove after drinking/rode with drunk driver in past 30 days	47.6 (43.8-51.4)	49.6 (44.5-54.7)	0.64, .442
Any marijuana use in past 30 days	22.6 (18.2-27.0)	22.2 (17.8-26.6)	0.04, .849

^a Chi-square tests were conducted, all with one degree of freedom, comparing 1999 and 2001 rates.
^b Rates reflect direct standardization to the 1999 sample profile with respect to gender, age, White/non-White race, and on/off-campus housing status.
^c Defined as >=5 drinks in one occasion for males, >=4 drinks for females.
^d Analysis subsample n = 837 for 1999, n = 760 for 2000 (unweighted). "Usual" heavy episodic drinking defined as usually engaging in heavy episodic drinking whenever they drink.