|   | 
        Physical | 
        Psychological | 
        Social | 
        Environmental | 
       
      
        |   | 
        r | 
        P    Value | 
        r | 
        P    Value | 
        r | 
        P    Value | 
        r | 
        P    Value | 
       
      
        | Drug    type | 
        0.035 | 
        0.828 | 
        -0.073 | 
        0.649 | 
        -0.033 | 
        0.837 | 
        -0.138 | 
        0.390 | 
       
      
        | Abstinent    periods | 
        0.302  | 
        0.055  | 
        0.393 | 
        0.011* | 
        0.240  | 
        0.130  | 
        0.255  | 
        0.108  | 
       
      
        | Average    daily dosage | 
        -0.183  | 
        0.252  | 
        -0.257  | 
        0.105  | 
        -0.206  | 
        0.197  | 
        -0.310  | 
        0.049* | 
       
      
        | Average    daily frequency | 
        -0.257  | 
        0.104 | 
        -0.293 | 
        0.063 | 
        -0.235  | 
        0.139  | 
        -0.319  | 
        0.042* | 
       
      
        | Frequent    injection behaviour | 
        -0.413  | 
        0.007** | 
        -0.321 | 
        0.040* | 
        -0.277  | 
        0.080  | 
        -0.377  | 
        0.015* | 
       
     
    *Correlation    is significant at the 0.05 level (2-tailed); 
    **Correlation is significant at    the 0.01 level (2-tailed). Frequent injection behavior: at least 2 times of    injection behavior per day. |