Table 2 The percentage of different severities of depression and anxiety among the three groups of substance users
| Â | Methamphetamine-only | Heroin-only | Poly-substance | P value |
|---|---|---|---|---|
(N = 232) | (N = 843) | (N = 411) | ||
Anxiety | Â | Â | Â | 0.07 |
  No | 84(36.2%) | 355(42.1%) | 188(45.7%) |  |
  Mild | 67(28.9%) | 262(31.1%) | 115(28.0%) |  |
  Moderate | 63(27.2%) | 157(18.6%) | 77(18.7%) |  |
  Severe | 18(7.8%) | 69(8.2%) | 31(7.5%) |  |
Depression | Â | Â | Â | 0.005 |
  No | 54(23.3%) | 262(31.1%) | 141(34.3%) |  |
  Mild | 91(39.2%) | 309(36.7%) | 129(31.4%) |  |
  Moderate | 65(28.0%) | 225(26.7%) | 125(30.4%) |  |
  Severe | 22(9.5%) | 47(5.6%) | 16(3.9%) |  |