Table 3.
Nested logistic regression analysis results for the social situation/context stream of influence (N=534 students).
| Variables | Model 1 Ultimate Odds Ratio (95% CI) |
Model 2 Ultimate + Distal Odds Ratio (95% CI) |
Model 3 Ultimate + Distal + Proximal Odds Ratio (95% CI) |
Model 4 Ultimate + Distal + Proximal + Immediate Precursor Odds Ratio (95% CI) |
|---|---|---|---|---|
| Social Situation/Context Stream | ||||
| Ultimate Underlying Causes | ||||
| Residence | ||||
| Off-Campus Housing | 1.00 | 1.00 | 1.00 | 1.00 |
| Other Housing | 0.47 (0.24, 0.89)* | 0.38 (0.18, 0.83)* | 0.40 (0.19, 0.88)* | 0.17 (0.06, 0.48)** |
| Distal Predisposing Influences | ||||
| Greek Life | ||||
| Non-member | 1.00 | 1.00 | 1.00 | |
| Member | 2.30 (1.16, 4.53)* | 1.96 (0.97, 3.98) | 1.77 (0.76, 4.13) | |
| Varsity Sports | ||||
| Non-member | 1.00 | 1.00 | 1.00 | |
| Member | 2.32 (1.11, 4.84)* | 2.00 (0.93, 4.28) | 3.13 (1.22, 8.06)* | |
| Perceptions of IUPS by Socializing Agentsa | ||||
| Friends | 1.82 (1.14, 2.91)* | 1.70 (1.05, 2.73)* | 1.66 (0.91, 3.03) | |
| Family | 1.49 (0.96, 2.33) | 1.48 (0.94, 2.34) | 0.91 (0.51, 1.62) | |
| Faculty/Staff | 0.55 (0.35, 0.87)* | 0.59 (0.37, 0.96)* | 0.91 (0.51, 1.52) | |
| Endorsement of IUPS by Socializing Agentsb | ||||
| Friends | 2.83 (2.00, 4.02)** | 2.15 (1.49, 3.11)** | 1.73 (1.10, 2.73)* | |
| Family | 1.26 (0.63, 2.53) | 1.02 (0.49, 2.12) | 0.62 (0.28, 1.37) | |
| Faculty/Staff | 1.05 (0.54, 2.02) | 1.27 (0.65, 2.47) | 1.58 (0.76, 3.29) | |
| Motivation to Complyc | 0.89 (0.70, 1.08) | 0.87 (0.70, 1.08) | 0.97 (0.75, 1.25) | |
| Proximal Immediate Predictors | ||||
| Perception of Prevalence Ratesd | 1.04 (0.74, 1.47) | 1.30 (0.86, 1.97) | ||
| Campus IUPS | 1.70 (1.28, 2.26)** | 1.22 (0.85, 1.74) | ||
| Friends IUPS | ||||
| Immediate Precursors | ||||
| IUPS Intentionse | 5.68 (3.68, 8.77)** | |||
| Pseudo-R2 | 1.27% | 30.56% | 34.39% | 52.69% |
| Log Likelihood | −240.69 | −169.28 | −159.96 | −115.33 |
Note. Each of the four blocks significantly contributed to the final model. IUPS = Illicit use of prescription stimulants.
a
Response options for items range from 1 = Very negatively to 5 = Very positively
b
Response options range from 1 = None to 5 = All
c
Response options range from 1= Strongly disagree to 5 = Strongly agree
d
Response options for composite range from 1 = 0% to More than 6 = 75%
e
Response options for items in composite measure range from 1 = Definitely won’t to 5 = Definitely will
*
p<0.05.
**
p<0.01.