Effects of a web-based pre-enrollment alcohol brief motivational intervention on college student retention and alcohol-related violations

Figures & data

Table 1. Sample demographics.

	2011 Cohort		2012 Cohort
	Y1-CAP Completed	Y1-CAP Not Completed	Y1-CAP Completed	Y1-CAP Not Completed
Gender
Men	1,366	331	1,258	382
Women	1,455	212	1,220	250
Unknown
Ethnicity
White	2,506	461	2,166	508
African American	53	8	35	22
Asian	60	9	55	16
Native American/ /Hawaiian/Pacific Islander	10	4	13	3
Multiracial	69	16	75	32
No answer	123	45	135	51
Age
18 or 19	2,814	541	2,450	611
20+	7	2	29	21
Residency
Nebraska resident	2,350	470	2004	525
Nonresident	477	66	475	107
Unknown	1

Figure 1. 2011 Cohort survival function.

Figure 2. 2011 Cohort hazard function.

Figure 3. 2012 Cohort survival function.

Figure 4. 2012 Cohort hazard function.

Table 2. Cox regression 2011 and 2012 cohorts’ survival.

	B	SE	Wald	df	p	Odds Ratio	95% CI
							Lower	Upper
2011 Cohort
Race	−.044	.080	.307	1	.580	.957	.819	1.118
Resident	.021	.065	.105	1	.746	1.021	.899	1.160
Gender	−.007	.048	.020	1	.886	.993	.904	1.091
Completed Y1-CAP	−.181	.062	8.548	1	.003*	.834	.739	.942
2012 Cohort
Race	−.188	.101	3.491	1	.062	.828	.680	1.009
Resident	.023	.086	.074	1	.785	1.024	.865	1.212
Gender	.002	.068	.001	1	.972	1.002	.878	1.144
Completed Y1-CAP	−.469	.075	38.971	1	.000*	.625	.540	.725

* p < .05. **p < .01.

Table 3. University alcohol-related judicial sanctions and off-campus alcohol citations by Y1-CAP completion.

	Year 1				Year 2
Did Y1-CAP	N	%	N	%	N	%	N	%
Campus judicial alcohol sanction
	No		Yes		No		Yes
2011 Cohort
Yes	2,587	91.7	234	8.3	2,234	97.9	49	2.1
No	473	87.1	70	12.9	406	95.1	21	4.9
2012 Cohort
Yes	2,296	92.6	183	7.4	2,023	96.7	69	3.3
No	562	88.9	70	11.1	455	96.4	17	3.6
Off-campus alcohol citation
	No		Yes		No		Yes
2011 Cohort
Yes	2,678	94.9	143	5.1	2,226	97.5	57	2.5
No	486	89.5	57	10.5	404	94.6	23	5.4
2012 Cohort
Yes	2,395	96.6	84	3.4	2,030	97.0	62	3.0
No	590	93.4	42	6.6	454	96.2	18	3.8

Table 4. Logistic regression 2011 cohort university alcohol-related judicial sanctions and off-campus alcohol citations.

	B	SE	Wald	df	p	Odds Ratio	95% CI
							Lower	Upper
Campus judicial alcohol sanction
Year 1
Sex	.269	.122	4.845	1	.028*	1.309	1.030	1.664
Ethnicity	.299	.226	1.750	1	.186	1.349	.866	2.103
Residency	.187	.159	1.381	1	.240	1.205	.883	1.646
CAP done	−.480	.146	10.731	1	.001**	.619	.464	.825
Constant	−2.556	.313	66.732	1	.000**	.078
Year 2
Sex	.675	.260	6.764	1	.009**	1.964	1.181	3.267
Ethnicity	.178	.434	.168	1	.682	1.195	.510	2.799
Residency	.210	.324	.420	1	.517	1.234	.654	2.328
CAP done	−.792	.269	8.637	1	.003**	.453	.267	.768
Constant	−3.814	.617	38.222	1	.000**	.022
Off-campus alcohol citation
Year 1
Sex	.381	.150	6.428	1	.011*	1.464	1.090	1.966
Ethnicity	.330	.277	1.414	1	.234	1.390	.808	2.394
Residency	.298	.188	2.501	1	.114	1.347	.931	1.948
CAP done	−.769	.166	21.472	1	.000**	.463	.335	.641
Constant	−3.018	.376	64.364	1	.000**	.049
Year 2
Sex	1.067	.263	16.494	1	.000**	2.908	1.737	4.867
Ethnicity	.757	.520	2.120	1	.145	2.131	.770	5.903
Residency	−.152	.345	.193	1	.660	.859	.437	1.690
CAP done	−.692	.256	7.308	1	.007**	.500	.303	.827
Constant	−4.148	.691	35.992	1	.000**	.016

Note. Sex: 1 = man, 0 = woman; ethnicity: 1 = white, 0 = non-white; residency: 1 = nonresident student, 0 = resident student; CAP done: 1 = completed Y1-CAP, 0 = did not complete Y1-CAP.

* p < .05.

** p < .01.

Table 5. Logistic regression 2012 cohort university alcohol-related judicial sanctions and off-campus alcohol citations.

	B	S.E.	Wald	df	p	Odds Ratio	95% CI
							Lower	Upper
Campus judicial alcohol sanction
Year 1
Sex	.483	.137	12.448	1	.000**	1.622	1.240	2.121
Ethnicity	.148	.221	.446	1	.504	1.159	.752	1.787
Residency	.072	.169	.183	1	.669	1.075	.772	1.496
CAP done	−.411	.149	7.581	1	.006**	.663	.494	.888
Constant	−2.608	.328	63.153	1	.000**	.074
Year 2
Sex	.763	.236	10.403	1	.001**	2.144	1.349	3.408
Ethnicity	.007	.361	.000	1	.985	1.007	.496	2.043
Residency	.486	.254	3.662	1	.056	1.627	.988	2.677
CAP done	−.056	.277	.042	1	.839	.945	.549	1.627
Constant	−4.370	.552	62.783	1	.000**	.013
Off-campus alcohol citation
Year 1
Sex	−.411	.149	7.581	1	.006**	.663	.494	.888
Ethnicity	.406	.337	1.456	1	.228	1.501	.776	2.905
Residency	−.149	.250	.355	1	.551	.862	.528	1.406
CAP done	−.697	.196	12.660	1	.000**	.498	.339	.731
Constant	−2.993	.476	39.499	1	.000**	.050
Year 2
Sex	.951	.254	13.974	1	.000**	2.588	1.572	4.260
Ethnicity	.078	.382	.041	1	.839	1.081	.511	2.284
Residency	.537	.262	4.219	1	.040*	1.711	1.025	2.857
CAP done	−.223	.275	.660	1	.416	.800	.467	1.370
Constant	−4.573	.576	62.936	1	.000**	.010

Note. Sex: 1 = man, 0 = woman; ethnicity: 1 = white, 0 = non-white; residency: 1 = nonresident student, 0 = resident student; CAP done: 1 = completed Y1-CAP, 0 = did not complete Y1-CAP.

* p < .05.

** p < .01.