Note: the missing data for those don’t have pnf data means they did not click the link to view the pnf (n=152). There were also students who clicked the link but then did not view any of the pages (n=31). Some students did not complete SM1 but did complete later surveys - specifically 32, 22 and 20 students completed SM 2, 3 and 4 but not SM 1, respectively,
| No (N=100) |
Yes(Partial or complete) (N=58) |
Overall (N=158) |
|
|---|---|---|---|
| Age (years) | |||
| Mean (SD) | 18.1 (0.219) | 18.0 (0.131) | 18.0 (0.192) |
| Sex | |||
| Male | 41 (41.0%) | 17 (29.3%) | 58 (36.7%) |
| Female | 59 (59.0%) | 41 (70.7%) | 100 (63.3%) |
| Race/ethnicity | |||
| Asian | 6 (6.0%) | 3 (5.2%) | 9 (5.7%) |
| Black | 0 (0%) | 0 (0%) | 0 (0%) |
| Hispanic/Latinx | 4 (4.0%) | 1 (1.7%) | 5 (3.2%) |
| White | 87 (87.0%) | 50 (86.2%) | 137 (86.7%) |
| Other/Multi | 3 (3.0%) | 4 (6.9%) | 7 (4.4%) |
| Pre-college drinking | |||
| Never | 4 (4.0%) | 2 (3.4%) | 6 (3.8%) |
| 1 to 9 occasions | 23 (23.0%) | 21 (36.2%) | 44 (27.8%) |
| 10+ occasions | 73 (73.0%) | 35 (60.3%) | 108 (68.4%) |
| Pre-college binge drinking (times/30 days) | |||
| None | 39 (39.0%) | 23 (39.7%) | 62 (39.2%) |
| 1 time | 22 (22.0%) | 17 (29.3%) | 39 (24.7%) |
| 2 times | 19 (19.0%) | 11 (19.0%) | 30 (19.0%) |
| 3-5 times | 15 (15.0%) | 6 (10.3%) | 21 (13.3%) |
| 6-9 times | 4 (4.0%) | 1 (1.7%) | 5 (3.2%) |
| 10+ times | 1 (1.0%) | 0 (0%) | 1 (0.6%) |
| Pre-college intention to pledge Greek life | |||
| No | 45 (45.0%) | 34 (58.6%) | 79 (50.0%) |
| Yes | 22 (22.0%) | 8 (13.8%) | 30 (19.0%) |
| Undecided | 33 (33.0%) | 16 (27.6%) | 49 (31.0%) |
| Residence | |||
| Campus housing | 99 (99.0%) | 58 (100%) | 157 (99.4%) |
| Other | 1 (1.0%) | 0 (0%) | 1 (0.6%) |
| Parents' highest level of education | |||
| Bachelor's or higher | 80 (80.0%) | 45 (77.6%) | 125 (79.1%) |
| Less than bachelor's | 20 (20.0%) | 12 (20.7%) | 32 (20.3%) |
| Don't know | 0 (0%) | 1 (1.7%) | 1 (0.6%) |
| Biological family member with clear drinking problem | |||
| No | 57 (57.0%) | 30 (51.7%) | 87 (55.1%) |
| Yes | 43 (43.0%) | 28 (48.3%) | 71 (44.9%) |
| Pre-college influence of religious beliefs (0(none) to 4(extreme)) | |||
| Mean (SD) | 2.10 (1.23) | 2.14 (1.26) | 2.11 (1.24) |
| Missing | 1 (1.0%) | 0 (0%) | 1 (0.6%) |
| Group | |||
| Experimental Early | 45 (45.0%) | 30 (51.7%) | 75 (47.5%) |
| Experimental Late | 55 (55.0%) | 28 (48.3%) | 83 (52.5%) |
| Stage.2.Intervention | |||
| Basics | 46 (46.0%) | 32 (55.2%) | 78 (49.4%) |
| Coach | 54 (54.0%) | 26 (44.8%) | 80 (50.6%) |
table1(~ age + sex + race + ALCfreq_life + ALCfreqbinge_30days_lab + greek +
living_on_campus + parent_highest_ed + bio_drinking_prob + DGreligion_infl_curr + Group
+Stage.2.Intervention |engagement, data=dat.HD,
render.continuous=c(.="Mean (SD)"))| None (N=57) |
Just visited (N=43) |
Partial (N=26) |
Complete (N=32) |
Overall (N=158) |
|
|---|---|---|---|---|---|
| Age (years) | |||||
| Mean (SD) | 18.1 (0.225) | 18.0 (0.213) | 18.0 (0.196) | 18.0 (0) | 18.0 (0.192) |
| Sex | |||||
| Male | 26 (45.6%) | 15 (34.9%) | 12 (46.2%) | 5 (15.6%) | 58 (36.7%) |
| Female | 31 (54.4%) | 28 (65.1%) | 14 (53.8%) | 27 (84.4%) | 100 (63.3%) |
| Race/ethnicity | |||||
| Asian | 2 (3.5%) | 4 (9.3%) | 1 (3.8%) | 2 (6.3%) | 9 (5.7%) |
| Black | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) |
| Hispanic/Latinx | 3 (5.3%) | 1 (2.3%) | 0 (0%) | 1 (3.1%) | 5 (3.2%) |
| White | 49 (86.0%) | 38 (88.4%) | 24 (92.3%) | 26 (81.3%) | 137 (86.7%) |
| Other/Multi | 3 (5.3%) | 0 (0%) | 1 (3.8%) | 3 (9.4%) | 7 (4.4%) |
| Pre-college drinking | |||||
| Never | 3 (5.3%) | 1 (2.3%) | 1 (3.8%) | 1 (3.1%) | 6 (3.8%) |
| 1 to 9 occasions | 10 (17.5%) | 13 (30.2%) | 10 (38.5%) | 11 (34.4%) | 44 (27.8%) |
| 10+ occasions | 44 (77.2%) | 29 (67.4%) | 15 (57.7%) | 20 (62.5%) | 108 (68.4%) |
| Pre-college binge drinking (times/30 days) | |||||
| None | 19 (33.3%) | 20 (46.5%) | 10 (38.5%) | 13 (40.6%) | 62 (39.2%) |
| 1 time | 14 (24.6%) | 8 (18.6%) | 9 (34.6%) | 8 (25.0%) | 39 (24.7%) |
| 2 times | 12 (21.1%) | 7 (16.3%) | 5 (19.2%) | 6 (18.8%) | 30 (19.0%) |
| 3-5 times | 9 (15.8%) | 6 (14.0%) | 1 (3.8%) | 5 (15.6%) | 21 (13.3%) |
| 6-9 times | 2 (3.5%) | 2 (4.7%) | 1 (3.8%) | 0 (0%) | 5 (3.2%) |
| 10+ times | 1 (1.8%) | 0 (0%) | 0 (0%) | 0 (0%) | 1 (0.6%) |
| Pre-college intention to pledge Greek life | |||||
| No | 25 (43.9%) | 20 (46.5%) | 14 (53.8%) | 20 (62.5%) | 79 (50.0%) |
| Yes | 11 (19.3%) | 11 (25.6%) | 3 (11.5%) | 5 (15.6%) | 30 (19.0%) |
| Undecided | 21 (36.8%) | 12 (27.9%) | 9 (34.6%) | 7 (21.9%) | 49 (31.0%) |
| Residence | |||||
| Campus housing | 57 (100%) | 42 (97.7%) | 26 (100%) | 32 (100%) | 157 (99.4%) |
| Other | 0 (0%) | 1 (2.3%) | 0 (0%) | 0 (0%) | 1 (0.6%) |
| Parents' highest level of education | |||||
| Bachelor's or higher | 48 (84.2%) | 32 (74.4%) | 21 (80.8%) | 24 (75.0%) | 125 (79.1%) |
| Less than bachelor's | 9 (15.8%) | 11 (25.6%) | 5 (19.2%) | 7 (21.9%) | 32 (20.3%) |
| Don't know | 0 (0%) | 0 (0%) | 0 (0%) | 1 (3.1%) | 1 (0.6%) |
| Biological family member with clear drinking problem | |||||
| No | 34 (59.6%) | 23 (53.5%) | 13 (50.0%) | 17 (53.1%) | 87 (55.1%) |
| Yes | 23 (40.4%) | 20 (46.5%) | 13 (50.0%) | 15 (46.9%) | 71 (44.9%) |
| Pre-college influence of religious beliefs (0(none) to 4(extreme)) | |||||
| Mean (SD) | 2.20 (1.24) | 1.98 (1.22) | 2.12 (1.28) | 2.16 (1.27) | 2.11 (1.24) |
| Missing | 1 (1.8%) | 0 (0%) | 0 (0%) | 0 (0%) | 1 (0.6%) |
| Group | |||||
| Experimental Early | 24 (42.1%) | 21 (48.8%) | 12 (46.2%) | 18 (56.3%) | 75 (47.5%) |
| Experimental Late | 33 (57.9%) | 22 (51.2%) | 14 (53.8%) | 14 (43.8%) | 83 (52.5%) |
| Stage.2.Intervention | |||||
| Basics | 30 (52.6%) | 16 (37.2%) | 12 (46.2%) | 20 (62.5%) | 78 (49.4%) |
| Coach | 27 (47.4%) | 27 (62.8%) | 14 (53.8%) | 12 (37.5%) | 80 (50.6%) |
| No (N=61) |
Yes (N=376) |
Overall (N=437) |
|
|---|---|---|---|
| Age (years) | |||
| Mean (SD) | 0.131 (0.340) | 0.0585 (0.235) | 0.0686 (0.253) |
| Sex | |||
| Male | 20 (32.8%) | 135 (35.9%) | 155 (35.5%) |
| Female | 41 (67.2%) | 241 (64.1%) | 282 (64.5%) |
| Race/ethnicity | |||
| Asian | 4 (6.6%) | 40 (10.6%) | 44 (10.1%) |
| Black | 1 (1.6%) | 15 (4.0%) | 16 (3.7%) |
| Hispanic/Latinx | 3 (4.9%) | 18 (4.8%) | 21 (4.8%) |
| White | 50 (82.0%) | 282 (75.0%) | 332 (76.0%) |
| Other/Multi | 3 (4.9%) | 21 (5.6%) | 24 (5.5%) |
| Pre-college drinking | |||
| Never | 10 (16.4%) | 109 (29.0%) | 119 (27.2%) |
| 1 to 9 occasions | 24 (39.3%) | 146 (38.8%) | 170 (38.9%) |
| 10+ occasions | 27 (44.3%) | 121 (32.2%) | 148 (33.9%) |
| Pre-college binge drinking (times/30 days) | |||
| None | 37 (60.7%) | 291 (77.4%) | 328 (75.1%) |
| 1 time | 11 (18.0%) | 38 (10.1%) | 49 (11.2%) |
| 2 times | 9 (14.8%) | 25 (6.6%) | 34 (7.8%) |
| 3-5 times | 2 (3.3%) | 16 (4.3%) | 18 (4.1%) |
| 6-9 times | 2 (3.3%) | 5 (1.3%) | 7 (1.6%) |
| 10+ times | 0 (0%) | 1 (0.3%) | 1 (0.2%) |
| Pre-college intention to pledge Greek life | |||
| No | 31 (50.8%) | 251 (66.8%) | 282 (64.5%) |
| Yes | 9 (14.8%) | 38 (10.1%) | 47 (10.8%) |
| Undecided | 21 (34.4%) | 87 (23.1%) | 108 (24.7%) |
| Residence | |||
| Campus housing | 59 (96.7%) | 344 (91.5%) | 403 (92.2%) |
| Other | 2 (3.3%) | 32 (8.5%) | 34 (7.8%) |
| Parents' highest level of education | |||
| Bachelor's or higher | 50 (82.0%) | 304 (80.9%) | 354 (81.0%) |
| Less than bachelor's | 11 (18.0%) | 65 (17.3%) | 76 (17.4%) |
| Don't know | 0 (0%) | 7 (1.9%) | 7 (1.6%) |
| Biological family member with clear drinking problem | |||
| No | 29 (47.5%) | 236 (62.8%) | 265 (60.6%) |
| Yes | 32 (52.5%) | 139 (37.0%) | 171 (39.1%) |
| Missing | 0 (0%) | 1 (0.3%) | 1 (0.2%) |
| Pre-college influence of religious beliefs (0(none) to 4(extreme)) | |||
| Mean (SD) | 2.11 (1.24) | 2.15 (1.28) | 2.15 (1.27) |
| Missing | 0 (0%) | 2 (0.5%) | 2 (0.5%) |
| Group | |||
| Experimental Early | 29 (47.5%) | 183 (48.7%) | 212 (48.5%) |
| Experimental Late | 32 (52.5%) | 193 (51.3%) | 225 (51.5%) |
Overall participation is defined as partially completing the PNF (viewing at least one page) AND completing at least one self-monitoring survey. Heavy drinkers must have also either sent at least one message to the coach or had partial completion of web-BASICS, in addition to the previous criteria.
##
## Call:
## glm(formula = part2 ~ age + sex + white + precolDrink + precolBinge +
## greek + living_on_campus + parent_college + bio_drinking_prob +
## DGreligion_infl_curr + Group, family = "binomial", data = part.API[-c(202,
## 265, 356), ])
##
## Deviance Residuals:
## Min 1Q Median 3Q Max
## -1.0431 -0.5682 -0.4818 -0.3775 2.3989
##
## Coefficients:
## Estimate Std. Error z value Pr(>|z|)
## (Intercept) -2.62998 0.52682 -4.992 5.97e-07 ***
## age 0.90701 0.45614 1.988 0.0468 *
## sexFemale 0.14960 0.30759 0.486 0.6267
## whiteWhite 0.08525 0.37858 0.225 0.8218
## precolDrink10+ occasions 0.03380 0.35225 0.096 0.9235
## precolBinge1-2 times 0.65236 0.36976 1.764 0.0777 .
## precolBinge>2 times 0.22586 0.63759 0.354 0.7232
## greekYes 0.47584 0.43890 1.084 0.2783
## greekUndecided 0.53887 0.32620 1.652 0.0985 .
## living_on_campusOther -0.88676 0.78000 -1.137 0.2556
## parent_collegeLess than bachelor's 0.06829 0.38343 0.178 0.8586
## bio_drinking_probYes 0.53457 0.29136 1.835 0.0665 .
## DGreligion_infl_curr -0.02035 0.11499 -0.177 0.8595
## GroupExperimental Late 0.02199 0.29576 0.074 0.9407
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## (Dispersion parameter for binomial family taken to be 1)
##
## Null deviance: 352.38 on 433 degrees of freedom
## Residual deviance: 331.83 on 420 degrees of freedom
## AIC: 359.83
##
## Number of Fisher Scoring iterations: 5##
## Call:
## glm(formula = part2 ~ age + precolBinge + greek + living_on_campus +
## bio_drinking_prob, family = "binomial", data = part.API)
##
## Deviance Residuals:
## Min 1Q Median 3Q Max
## -1.0318 -0.5811 -0.5008 -0.3982 2.4040
##
## Coefficients:
## Estimate Std. Error z value Pr(>|z|)
## (Intercept) -2.4950 0.2589 -9.637 <2e-16 ***
## age 0.9048 0.4525 2.000 0.0455 *
## precolBinge1-2 times 0.6853 0.3243 2.113 0.0346 *
## precolBinge>2 times 0.2671 0.5795 0.461 0.6449
## greekYes 0.4821 0.4324 1.115 0.2649
## greekUndecided 0.5348 0.3192 1.675 0.0939 .
## living_on_campusOther -0.8722 0.7637 -1.142 0.2534
## bio_drinking_probYes 0.5524 0.2852 1.937 0.0528 .
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## (Dispersion parameter for binomial family taken to be 1)
##
## Null deviance: 352.98 on 435 degrees of freedom
## Residual deviance: 332.77 on 428 degrees of freedom
## (1 observation deleted due to missingness)
## AIC: 348.77
##
## Number of Fisher Scoring iterations: 5##
## Call:
## glm(formula = part2 ~ age + precolBinge + greek + bio_drinking_prob,
## family = "binomial", data = part.API)
##
## Deviance Residuals:
## Min 1Q Median 3Q Max
## -1.2444 -0.5788 -0.4983 -0.3874 2.2921
##
## Coefficients:
## Estimate Std. Error z value Pr(>|z|)
## (Intercept) -2.5518 0.2556 -9.983 <2e-16 ***
## age 0.9164 0.4548 2.015 0.0439 *
## precolBinge1-2 times 0.7090 0.3243 2.186 0.0288 *
## precolBinge>2 times 0.3216 0.5784 0.556 0.5782
## greekYes 0.4989 0.4315 1.156 0.2475
## greekUndecided 0.5284 0.3191 1.656 0.0977 .
## bio_drinking_probYes 0.5542 0.2849 1.945 0.0517 .
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## (Dispersion parameter for binomial family taken to be 1)
##
## Null deviance: 352.98 on 435 degrees of freedom
## Residual deviance: 334.38 on 429 degrees of freedom
## (1 observation deleted due to missingness)
## AIC: 348.38
##
## Number of Fisher Scoring iterations: 5Note - there are two Age variables in the baseline data each taken at different months. I used the Age information collected earlier (in August). For the students aged 19 or older (n=30), 8 (27%) of them did not ‘participate’ overall in the API intervention. Out of those aged 18 (n=407), 53 (13%) did not ‘participate’ overall. I re-ran the models without age below.
##
## Call:
## glm(formula = part2 ~ sex + white + precolDrink + precolBinge +
## greek + living_on_campus + parent_college + bio_drinking_prob +
## DGreligion_infl_curr + Group, family = "binomial", data = part.API[-c(202,
## 265, 356), ])
##
## Deviance Residuals:
## Min 1Q Median 3Q Max
## -0.9556 -0.5637 -0.4661 -0.4026 2.3659
##
## Coefficients:
## Estimate Std. Error z value Pr(>|z|)
## (Intercept) -2.56401 0.52176 -4.914 8.92e-07 ***
## sexFemale 0.13481 0.30590 0.441 0.6594
## whiteWhite 0.12949 0.37625 0.344 0.7307
## precolDrink10+ occasions 0.01505 0.34767 0.043 0.9655
## precolBinge1-2 times 0.66233 0.36498 1.815 0.0696 .
## precolBinge>2 times 0.15698 0.63414 0.248 0.8045
## greekYes 0.45096 0.43492 1.037 0.2998
## greekUndecided 0.54187 0.32452 1.670 0.0950 .
## living_on_campusOther -0.86653 0.76991 -1.125 0.2604
## parent_collegeLess than bachelor's 0.05283 0.38225 0.138 0.8901
## bio_drinking_probYes 0.51800 0.28978 1.788 0.0739 .
## DGreligion_infl_curr -0.01244 0.11441 -0.109 0.9134
## GroupExperimental Late 0.01497 0.29389 0.051 0.9594
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## (Dispersion parameter for binomial family taken to be 1)
##
## Null deviance: 352.38 on 433 degrees of freedom
## Residual deviance: 335.39 on 421 degrees of freedom
## AIC: 361.39
##
## Number of Fisher Scoring iterations: 5##
## Call:
## glm(formula = part2 ~ precolBinge + bio_drinking_prob, family = "binomial",
## data = part.API[-c(202, 265, 356), ])
##
## Deviance Residuals:
## Min 1Q Median 3Q Max
## -0.8271 -0.5724 -0.4429 -0.4429 2.1774
##
## Coefficients:
## Estimate Std. Error z value Pr(>|z|)
## (Intercept) -2.2723 0.2171 -10.467 < 2e-16 ***
## precolBinge1-2 times 0.8291 0.3142 2.639 0.00832 **
## precolBinge>2 times 0.2686 0.5749 0.467 0.64035
## bio_drinking_probYes 0.5464 0.2825 1.934 0.05311 .
## ---
## Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
##
## (Dispersion parameter for binomial family taken to be 1)
##
## Null deviance: 352.38 on 433 degrees of freedom
## Residual deviance: 340.67 on 430 degrees of freedom
## AIC: 348.67
##
## Number of Fisher Scoring iterations: 4## (Intercept) precolBinge1-2 times precolBinge>2 times
## 0.1030723 2.2912079 1.3081597
## bio_drinking_probYes
## 1.7269963The exponentiated coefficients are shown. Without age in the model, the stepwise regression selects pre-college binge drinking and whether a biological family member had a clear drinking problem as predictors. The odds of NOT participating for students who binge drank 1-2 times before college is 2.29 times that of students who did no binge drink before college (p-value=.00832). Having a parent with a drinking problem increases the odds of NOT participating by 73% (p-value=.05311).
## Value Std. Error t value
## age 2.5346146 0.4828175 1.92627977
## sexFemale 0.9529757 0.3341364 -0.14415046
## whiteWhite 1.4757471 0.4219960 0.92219919
## precolDrink10+ occasions 1.0237788 0.3967174 0.05923743
## precolBinge1-2 times 1.3127582 0.4330413 0.62841678
## precolBinge>2 times 0.8007174 0.8266002 -0.26886899
## greekYes 0.9457184 0.5803882 -0.09616049
## greekUndecided 1.7080043 0.3496875 1.53086858
## living_on_campusOther 2.8712664 0.5228642 2.01726007
## parent_collegeLess than bachelor's 1.3924284 0.3941710 0.83986205
## bio_drinking_probYes 1.4972044 0.3233011 1.24837075
## DGreligion_infl_curr 1.1867385 0.1267727 1.35051816
## GroupExperimental Late 1.2785462 0.3226896 0.76148609
## 2|0 32.8983685 0.6152416 5.67813244
## 0|1 99.9140229 0.6473437 7.11262049
## p value
## age 5.406945e-02
## sexFemale 8.853817e-01
## whiteWhite 3.564247e-01
## precolDrink10+ occasions 9.527630e-01
## precolBinge1-2 times 5.297310e-01
## precolBinge>2 times 7.880305e-01
## greekYes 9.233931e-01
## greekUndecided 1.258019e-01
## living_on_campusOther 4.366838e-02
## parent_collegeLess than bachelor's 4.009857e-01
## bio_drinking_probYes 2.118953e-01
## DGreligion_infl_curr 1.768498e-01
## GroupExperimental Late 4.463668e-01
## 2|0 1.361733e-08
## 0|1 1.138601e-12## Call:
## polr(formula = pnf.ord ~ sex + white + precolDrink + precolBinge +
## greek + living_on_campus + parent_college + bio_drinking_prob +
## DGreligion_infl_curr + Group, data = part.API[-c(202, 265,
## 356), ], Hess = TRUE)
##
## Coefficients:
## Value Std. Error t value
## sexFemale -0.066977 0.3319 -0.20181
## whiteWhite 0.434787 0.4201 1.03506
## precolDrink10+ occasions -0.006334 0.3907 -0.01621
## precolBinge1-2 times 0.279509 0.4267 0.65512
## precolBinge>2 times -0.296771 0.8233 -0.36047
## greekYes -0.095131 0.5779 -0.16462
## greekUndecided 0.568185 0.3472 1.63636
## living_on_campusOther 1.013524 0.5140 1.97187
## parent_collegeLess than bachelor's 0.312807 0.3922 0.79755
## bio_drinking_probYes 0.387749 0.3212 1.20706
## DGreligion_infl_curr 0.176672 0.1262 1.39971
## GroupExperimental Late 0.231394 0.3203 0.72236
##
## Intercepts:
## Value Std. Error t value
## 2|0 3.4121 0.6062 5.6290
## 0|1 4.5189 0.6392 7.0701
##
## Residual Deviance: 356.5167
## AIC: 384.5167## Value Std. Error t value
## sexFemale 0.9352164 0.3318828 -0.20181010
## whiteWhite 1.5446339 0.4200611 1.03505643
## precolDrink10+ occasions 0.9936860 0.3906523 -0.01621388
## precolBinge1-2 times 1.3224797 0.4266512 0.65512189
## precolBinge>2 times 0.7432143 0.8232884 -0.36047009
## greekYes 0.9092541 0.5778758 -0.16462134
## greekUndecided 1.7650610 0.3472257 1.63635722
## living_on_campusOther 2.7552941 0.5139916 1.97186924
## parent_collegeLess than bachelor's 1.3672575 0.3922097 0.79755028
## bio_drinking_probYes 1.4736592 0.3212341 1.20705912
## DGreligion_infl_curr 1.1932398 0.1262202 1.39971365
## GroupExperimental Late 1.2603554 0.3203305 0.72235934
## 2|0 30.3280002 0.6061645 5.62895268
## 0|1 91.7341017 0.6391591 7.07006206
## p value
## sexFemale 8.400652e-01
## whiteWhite 3.006426e-01
## precolDrink10+ occasions 9.870638e-01
## precolBinge1-2 times 5.123893e-01
## precolBinge>2 times 7.184956e-01
## greekYes 8.692420e-01
## greekUndecided 1.017648e-01
## living_on_campusOther 4.862454e-02
## parent_collegeLess than bachelor's 4.251315e-01
## bio_drinking_probYes 2.274094e-01
## DGreligion_infl_curr 1.615991e-01
## GroupExperimental Late 4.700736e-01
## 2|0 1.813071e-08
## 0|1 1.548644e-12## Call:
## polr(formula = pnf.ord ~ living_on_campus + bio_drinking_prob +
## DGreligion_infl_curr, data = part.API[-c(202, 265, 356),
## ], Hess = TRUE)
##
## Coefficients:
## Value Std. Error t value
## living_on_campusOther 0.9010 0.4591 1.962
## bio_drinking_probYes 0.4891 0.3079 1.589
## DGreligion_infl_curr 0.1729 0.1224 1.412
##
## Intercepts:
## Value Std. Error t value
## 2|0 2.7517 0.3724 7.3889
## 0|1 3.8446 0.4206 9.1415
##
## Residual Deviance: 362.9669
## AIC: 372.9669The only significant predictor from a model without age is living on campus (p-value = .004), however, note that only 34 students did not live on campus compared to 403 who did (reference group). The stepwise procedure chooses (from a model without age) living on campus, having a parent with a drinking problem and religion (although living on campus is barely significant in this model).
The levels of engagement are none, just visited, partial completion and full completion.
## Value Std. Error t value
## age 4.737856e-01 0.8121302 -0.91980389
## sexFemale 1.873440e+00 0.3241748 1.93653661
## whiteWhite 1.121158e+00 0.4611981 0.24796664
## precolDrink10+ occasions 6.170630e-01 0.3480612 -1.38706674
## precolBinge1-2 times 9.840586e-01 0.3364455 -0.04776341
## precolBinge>2 times 8.734755e-01 0.4871741 -0.27767317
## greekYes 6.631443e-01 0.4068297 -1.00966719
## greekUndecided 6.544540e-01 0.3572026 -1.18687275
## living_on_campusOther 2.256319e-01 1.5853240 -0.93914573
## parent_collegeLess than bachelor's 1.489625e+00 0.3913538 1.01832197
## bio_drinking_probYes 1.283051e+00 0.3025633 0.82376305
## DGreligion_infl_curr 1.023255e+00 0.1246905 0.18436413
## GroupExperimental Late 6.890817e-01 0.3129293 -1.19003057
## 0|1 7.208549e-07 14.6895122 -0.96278404
## 1|2 2.382503e-06 14.6816217 -0.88187525
## 2|3 5.720496e-06 14.6771737 -0.82246455
## p value
## age 0.35767525
## sexFemale 0.05280201
## whiteWhite 0.80416022
## precolDrink10+ occasions 0.16542141
## precolBinge1-2 times 0.96190480
## precolBinge>2 times 0.78126326
## greekYes 0.31265476
## greekUndecided 0.23527782
## living_on_campusOther 0.34765593
## parent_collegeLess than bachelor's 0.30852497
## bio_drinking_probYes 0.41007421
## DGreligion_infl_curr 0.85372781
## GroupExperimental Late 0.23403438
## 0|1 0.33565591
## 1|2 0.37784427
## 2|3 0.41081255## Value Std. Error t value p value
## sexFemale 1.8997769 0.3020402 2.124672 3.361398e-02
## precolDrink10+ occasions 0.5948406 0.3099354 -1.676033 9.373182e-02
## 0|1 0.5798378 0.3350492 -1.626647 1.038120e-01
## 1|2 1.8398048 0.3316852 1.838066 6.605262e-02
## 2|3 4.3084175 0.3500519 4.172440 3.013553e-05The exponentiated coefficients are displayed. There were no significant predictors for participation in the Stage 2 intervention, however, being female increases the odds of some level of participation (vs. none) by 87%. A stepwise procedure selects sex and pre-college drinking (10+ occations vs. >10 occations) as the main predictors.