NAcablative surgery (n=105) Residential compulsory detoxification (n=112)
Socio-demographic characteristics
Age, mean (SD),y 36.87  ±  5.33 36.38  ±  6.99
Male 101 (96.2) 99 (88.4)**
Education    
Elementary school 49 (46.7) 58 (51.8)
High school 42 (40.0) 46 (41.1)
Superior to special course 14 (13.3) 8 (7.1)
Marital status    
Unmarried 24 (22.9) 32 (28.6)
Married 52 (49.5) 49 (43.8)
Divorced/widowed 29 (27.6) 31 (27.7)
Employment    
Employed (high paid) 12 (11.4) 8 (7.1)
Employed (low paid) 63 (60.0) 60 (53.6)
Unemployed 30 (28.6) 44 (39.3)
Drug use characteristics Before treatment
Drug type    
Heroin 78 (74.3) 87 (77.7)
Non-heroin opiates 27 (25.7) 25 (22.3)
Months of regular use#,mean(SD),y 116.83  ±  41.54 113.10  ±  59.31
Average daily dosage,mean(SD),g/day 1.14  ±  0.74 1.05  ±  0.72
Frequent injection behaviour 63 (60.0) 68 (60.7)
After treatment (only for relapsed patients underwent surgery, n=41)
Drug type    
Herion 25 (61.0)  
Non-heroin opiates 14 (34.1)  
New type drugs 2 (4.9)  
Abstinent periods,mean(SD),m 12.15  ±  12.32  
Average daily dosage,mean(SD), g/day 1.13  ±  0.95  
Average daily frequency, mean(SD),/day 2.90  ±  1.56  
Frequent injection behaviour 24 (58.5)  
*Data are presented as number (percentage) unless otherwise indicated.
**Females are too less for both two groups to test the sex constitution difference.
#Regular use means at least weekly use.
Table 1: Socio-demographic and drug use characteristics by treatment condition*
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