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Table 1 Background characteristics and drug use of patients by censor at baseline, % or mean (S.D.)

From: Factors associated with one year retention to methadone maintenance treatment program among patients with heroin dependence in China

Characteristics Non dropout (N = 86) Dropout (N = 233) Total (N = 319) Df t value/Chi-square P-value
Age ** 40.42(9.30) 36.72(8.39) 37.71(8.77) 314 2.91 0.0039
Age of first use* 28.22(7.71) 26.21(7.04) 26.75(7.27) 312 2.2 0.0284
Average drug use times before entering MMT 3.58(1.56) 3.37(1.62) 3.44(1.61) 312 1.02 0.3064
Average drug use amount before entering MMT 0.76(0.40) 0.71(0.55) 0.72(0.51) 310 0.75 0.454
Dosage at baseline 30.26(13.46) 32.94(18.80) 32.23(17.55) 297 −1.16 0.2469
Surround drug users 1.77(2.80) 1.38(2.78) 1.66(2.79) 313 −1.5 0.134
Gender: Male(%) 67(77.91) 176(75.43) 243(76.1) 1 0.2115 0.6456
GROUP     1 0.9514 0.3294
 MMT + CM, n(%) 47(54.65) 113(48.50) 160(50.16)    
 MMT only, n(%) 39(45.35) 120(51.50) 159(49.84)    
Place***     1 65.7585 <.0001
 Kunming, n(%) 11(12.8) 149(63.95) 160(50.16)    
 Shanghai, n(%) 75(87.2) 84(36.05) 159(49.84)    
Education     1 0.329 0.5663
 Highschool and below, n(%) 85(98.48) 228(97.84) 313(98.12)    
 College and above, n(%) 1(1.16) 5(2.16) 6(1.88)    
Employment     2 4.6246 0.099
 Not in labor force, n(%) 3(3.49) 4(1.72) 7(2.19)    
 Unemploymed, n(%) 53(61.63) 119(50.86) 172(53.61)    
 Employed, n(%) 30(34.88) 110(47.41) 140(44.2)    
Race     1 1.458 0.2272
 Han, n(%) 84(97.65) 220(94.4) 304(95.27)    
 Others, n(%) 2(2.35) 13(5.6) 15(4.73)    
Living with someone with current alcohol problem       
 No(%) 98.84 96.55 97.17 1 1.1917 0.275
Living with someone who uses or abuses drugs       
 No(%) 91.86 91.38 91.51 1 0.0187 0.8912
Living status     2 4.869 0.0876
 Dependent, n(%) 72(83.72) 170(72.84) 242(75.86)    
 Independent, n(%) 14(16.28) 58(25) 72(22.57)    
 Others, n(%) 0(0.00) 5(2.16) 5(1.57)    
Primary drug     3 7.0797 0.0694
 No, n(%) 3(3.49) 7(3.03) 10(3.15)    
 Heroin, n(%) 52(60.47) 175(75.32) 127(71.29)    
 Alcohol with one or more drugs, n(%) 9(10.47) 15(6.49) 24(7.57)    
 Two or more drugs without alcohol, n(%) 22(25.58) 35(15.15) 57(17.98)    
Marital status     2 1.6219 0.4444
 Never married, n(%) 44(51.16) 104(44.83) 148(46.39)    
 Married/Remarried, n(%) 27(31.4) 90(38.79) 117(36.99)    
 Divorce/Windowed, n(%) 15(17.44) 39(16.38) 54(16.61)    
ASI score at baseline       
 Medical status composite score 0.13(0.19) 0.13(0.22) 0.13(0.22) 303 0.00 0.9962
 Employment status composite score*** 0.55(0.25) 0.5(0.29) 0.52(0.28) 305 5.09 <0.0001
 Alcohol use composite score 0.03(0.08) 0.06(0.11) 0.05(0.11) 295 −1.81 0.0717
 Drug use composite score 0.17(0.10) 0.2(0.10) 0.19(0.10) 303 −2.45 0.0148
 Legal status composite score*** 0.15(0.14) 0.08(0.11) 0.1(0.12) 284 4.35 <.0001
 Family status composite score 0.15(0.17) 0.11(0.13) 0.12(0.15) 297 0.29 0.7723
 Psychiatric status composite score 0.06(0.12) 0.05(0.13) 0.06(0.12) 308 0.44 0.6585
  1. Chi-square test or t-test on group differences. *p < 0.05, **p < 0.01, ***p < 0.001.