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

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