TABLE 1.
—Change in Incidence (%) of New Male Drug Users in Intervention and Control Areas Before and After Intervention Program: Longchuan County, Yunnan Province, China
| Intervention Area | Control Area | ||||||||
| Variable | Baseline Period (10/95–2/97) | Follow-Up Period (5/97–9/98) | Percentage-Point Change | Baseline Period (10/95–2/97) | Follow-Up Period (5/97–9/98) | Percentage-Point Change | Attributable Risk Reductiona | Incidence Ratio (95% CI) | P |
| Total | 3.47 (21/606) | 1.88 (11/584) | –1.59 | 2.10 (10/477) | 1.50 (7/466) | –0.60 | –0.99 | 1.3 (1.0, 1.8) | .048 |
| Age, y | |||||||||
| 15–19 | 3.30 (3/91) | 1.14 (1/88) | –2.16 | 0 (0/76) | 2.63 (2/76) | +2.63 | –4.79 | 152 (58, 429)b | <.001 |
| 20–29 | 6.82 (15/220) | 2.94 (6/204) | –3.88 | 4.12 (8/194) | 1.62 (3/185) | –2.50 | –1.38 | 0.9 (0.7, 1.2) | .43 |
| 30–39 | 1.66 (3/181) | 2.25 (4/178) | +0.59 | 1.38 (2/145) | 1.40 (2/143) | +0.02 | +0.57 | 0.8 (0.5, 1.0) | .07 |
| 40–49 | 0 (0/113) | 0 (0/113) | 0 | 0 (0/62) | 0 (0/62) | 0 | |||
| Marital status | |||||||||
| Single | 5.61 (11/196) | 2.70 (5/185) | –2.91 | 2.34 (4/171) | 2.41 (4/166) | +0.07 | –2.98 | 2.1 (1.7, 2.7) | <.001 |
| Married | 2.48 (10/403) | 1.53 (6/392) | –0.95 | 1.98 (6/303) | 1.01 (3/297) | –0.97 | +0.02 | 0.8 (0.6, 1.2) | .23 |
| Others | 0 (0/7) | 0 (0/7) | 0 | 0 (0/3) | 0 (0/3) | 0 | |||
| Ethnic group | |||||||||
| Jingpo | 5.59 (18/322) | 3.63 (11/303) | –1.96 | 3.45 (4/116) | 4.5 (5/111) | +1.05 | –3.01 | 2.0 (1.6, 2.4) | <.001 |
| Dai | 0.60 (1/168) | 0 (0/167) | –0.60 | 0.74 (2/270) | 0.75 (2/268) | +0.01 | –0.61 | 12.2 (4.4, 35.6)b | <.001 |
| Han | 1.83 (2/109) | 0 (0/107) | –1.83 | 5.41 (4/74) | 0 (0/70) | –5.41 | +3.58 | 0.3 (0.1, 1.4)b | .075 |
| Others | 0 (0/7) | 0 (0/7) | 0 | 0 (0/17) | 0 (0/17) | 0 | |||
| Education | |||||||||
| Illiterate/semiliterate | 7.50 (6/80) | 1.35 (1/74) | –6.15 | 0.94 (1/106) | 0.95 (1/105) | +0.01 | –6.16 | 5.6 (4.0, 7.7) | <.001 |
| Primary | 3.47 (12/346) | 2.10 (7/333) | –1.37 | 1.92 (5/260) | 1.57 (4/254) | –0.35 | –1.02 | 1.4 (1.0, 1.8) | .029 |
| Secondary | 1.69 (3/178) | 1.71 (3/175) | +0.02 | 3.60 (4/111) | 1.87 (2/107) | –1.73 | +1.75 | 0.5 (0.4, 0.7) | <.001 |
Note. CI = confidence interval.
aAttributable risk reduction = change in intervention group minus change in control group. Minus signs indicate decreases (i.e., actual reductions); plus signs indicate increases in attributable risk.
bAdjusted by using an incidence of 0.05% to replace 0% for calculating the incidence ratio.