TABLE 2—
Change in Incidence of New Male Drug Users Before and After Intervention Program in Intervention and Control Areas: Community Mobilization to Reduce Drug Use; Quang Ninh Province, Vietnam; 2003–2009
| Intervention Commune |
Comparison Commune |
||||||||
| Stratifying Variable | Baseline Period 12/01–12/03, % (No.) | Assessment Period 3/07–3/09, % (No.) | Incidence Change, % Points | Baseline Period 12/01–12/03, % (No.) | Assessment Period 3/07–3/09, % (No.) | Incidence Change, % Points | Attributable Incidence Changea | Ratio of Relative Risksb (95% CI) | P |
| Total | 2.6 (15/586) | 7.1 (39/551) | +4.5 | 1.4 (8/561) | 7.1 (39/547) | +5.7 | −1.2 | 0.6 (0.2, 1.4) | .22 |
| Age, y | |||||||||
| 15–19 | 2.5 (9/362) | 8.0 (24/301) | +5.5 | 0.9 (3/354) | 6.8 (18/265) | +5.9 | −0.4 | 0.4 (0.1, 1.7) | .21 |
| 20–24 | 2.7 (6/224) | 6.0 (15/250) | +3.3 | 2.4 (5/207) | 7.4 (21/282) | +5.0 | −1.7 | 0.7 (0.2, 2.8) | .68 |
| Ethnic group | |||||||||
| Kinh | 2.6 (15/574) | 7.0 (38/543) | +4.4 | 1.6 (8/497) | 7.7 (37/478) | +6.1 | −1.7 | 0.6 (0.2, 1.4) | .07 |
| Others | 0 (0/12) | 12.5 (1/8) | +12.5 | 0 (0/64) | 3.4 (2/58) | +3.4 | +9.1 | NA | NA |
| Marital status | |||||||||
| Single | 2.6 (15/575) | 7.2 (38/528) | +4.6 | 1.4 (8/551) | 7.4 (38/512) | +6.0 | −1.4 | 0.5 (0.2, 1.4) | .2 |
| Married | 0 (0/10) | 0 (0/17) | 0.0 | 0 (0/10) | 3.0 (1/33) | +3.0 | −3.0 | NA | NA |
| Divorced | 0 (0/1) | 25 (1/4) | +25 | NA | 0 (0/1) | NA | NA | NA | NA |
| Education level | |||||||||
| ≤ grade 9 | 3.7 (5/134) | 7.9 (5/63) | +4.2 | 2.1 (2/96) | 5.6 (4/72) | +3.5 | −0.6 | 0.8 (0.1, 6.2) | .83 |
| Grades 10–12 | 2.8 (9/321) | 6.5 (21/321) | +3.7 | 1.2 (4/333) | 7.0 (18/258) | +5.8 | −1.8 | 0.4 (0.1, 1.5) | .17 |
| ≥ some college | 0.8 (1/129) | 7.3 (12/164) | +6.5 | 1.6 (2/129) | 7.9 (17/215) | +6.3 | +0.2 | 1.9 (0.2, 22.4) | .37 |
Note. CI = confidence interval; NA = not available.
Attributable incidence change is the incidence change in the intervention group minus incidence change in the control group. Minus signs indicate that the incidence increase in the intervention group was lower than the incidence increase in the control group (i.e., the intervention helped reduce the risk of starting drug use), and vice versa.
A ratio of < 1 indicates that the relative risk (assessment vs baseline) for the intervention group is lower than that for the control group, and vice versa. Some ratios and the corresponding CIs and P values are left blank because they cannot be calculated when there is at least 1 zero incidence in the same data line.