Table 2.
Selected Sample Characteristics and Hazard Ratio (HR) Estimates of First Illegal Drug Use, Stratified by Gender Among a Sample of African American College Students on HBCU Campuses (n=7,372).
| Onset of illegal drug use |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Females (person periods= 13,167) | Males (person periods= 6,790) | |||||||||
| Row %a (n=4,775) | Crude HR | p value | aHR(95%CI)b | p value | Row % a (n=2,597) | Crude HR | p value | aHR(95%CI)b | p value | |
| Early sex by age 13 | ||||||||||
| No | 20.9* | 1.0 | --- | --- | 30.0* | 1.0 | --- | --- | ||
| Yes | 37.1* | 2.1(1.8-2.6) | <0.001 | See below | 42.2* | 1.6(1.4-1.9) | <0.001 | See below | ||
| Previous tobacco or alcohol (T/A) use | ||||||||||
| No | 2.3* | 1.0 | --- | --- | 4.5* | 1.0 | --- | --- | ||
| Yes | 35.0* | 2.9(2.6-3.4) | <0.001 | See below | 50.4* | 2.6(2.3-3.1) | <0.001 | See below | ||
| Early sex, previous tobacco/alcohol use | ||||||||||
| No, no | --- | 1.0 | 1.0 | --- | 1.0 | 1.0 | ||||
| Yes, no | --- | 2.2(1.7-2.9) | <0.001 | 2.1(1.6-2.8) | <0.001 | --- | 1.5(1.2-1.9) | <0.001 | 1.5(1.2-1.9) | 0.001 |
| No, yes | --- | 3.0(2.6-3.4) | <0.001 | 2.8(2.4-3.3) | <0.001 | --- | 2.7(2.2-3.2) | <0.001 | 2.7(2.2-3.3) | <0.001 |
| Yes, yes | --- | 4.5(3.4-5.9) | <0.001 | 4.5(3.4-6.0) | <0.001 | --- | 3.4(2.7-4.4) | <0.001 | 3.2(2.5-4.1) | <0.001 |
| Age group | ||||||||||
| 18 or younger | 21.5* | 1.0 | 1.0 | 30.8* | 1.0 | 1.0 | ||||
| 19 or older | 24.8* | 1.1(0.9-1.3) | 0.225 | 1.2(1.0-1.4) | 0.025 | 37.5* | 1.2(1.0-1.4) | 0.018 | 1.2(1.0-1.4) | 0.097 |
| Annual family income | ||||||||||
| $30,000 or below | 21.2 | 1.0 | 1.0 | 33.4 | 1.0 | 1.0 | ||||
| More than $30,000 | 23.1 | 1.1(1.0-1.3) | 0.086 | 1.1(1.0-1.3) | 0.084 | 33.3 | 1.0(0.9-1.2) | 0.794 | 1.0(0.9-1.2) | 0.718 |
| Importance of religion | ||||||||||
| Extremely or very important | 20.2* | 1.0 | 1.0 | 30.9* | 1.0 | 1.0 | ||||
| Not important | 34.3* | 1.9(1.7-2.3) | <0.001 | 1.7(1.5-2.1) | <0.001 | 39.7* | 1.4(1.2-1.7) | <0.001 | 1.4(1.1-1.6) | 0.001 |
| Parental educational level | ||||||||||
| Lower than college | 21.6 | 1.0 | 1.0 | 32.4 | 1.0 | 1.0 | ||||
| Some college or more | 22.5 | 1.1(0.9-1.3) | 0.515 | 1.1(0.9-1.2) | 0.475 | 33.1 | 1.0(0.9-1.2) | 0.653 | 1.1(0.9-1.3) | 0.356 |
*
Chi-square test p-value ‹ 0.05;
a.
Row % means the percentage of illegal drug use initiated after age 14 for each category of covariates. For T/A use, it means the percent of illegal drug use initiated after age 14 by whether the students initiated T/A use at the survey or not;
b.
Adjusted hazard ratio (aHR) estimates were adjusted for the covariates listed in the table and the college attended.