Table 2 Demographic and MMT characteristics between retained and dropout clients at 6- and 12- month follow-up

Age (yrs) mean (SD)

38.63(6.15)

38.23(6.10) ^**

38.85(6.24)

38.27(6.07) ^**

Sex n (%)

 Male

2865 (91.74)

2071 (94.91) ^***

1898 (92.09)

3038 (93.65) ^**

 Female

258 (8.26)

111 (5.09)

163 (7.91)

206 (6.35)

Employment n (%)

 Employed

1928 (61.74)

1118 (51.24) ^***

1287 (62.45)

1759(54.22) ^***

 Unemployed

1195 (38.26)

1064 (48.76)

774 (37.55)

1485(45.78)

Marital status n (%)

 Married

1445 (46.26)

1004 (46.01)

968 (46.97)

1481(45.65) ^*

 Unmarried

1698 (53.74)

1178(53.99)

1093 (53.03)

1763(54.96)

Education n (%)

 Primary school

611(19.56)

427(19.57) ^*

406(19.70)

632(19.48) ^***

 Junior school

1923(61.58)

1412(64.71)

1241(60.21)

2094(64.55)

 Senior school or higher

589(18.86)

343(15.72)

414(20.19)

518(15.97)

HIV n (%)

 Positive

206(6.60)

195(8.94) ^**

148(7.18)

253(7.80)

 Negative

2917(93.40)

1987(91.06)

1913(92.82)

2991(92.20)

HCV n (%)

 Positive

2427(79.73)

1482(76.27) ^**

1626(80.34)

2283(77.05) ^**

 Negative

617(20.27)

461(23.73)

398(19.66)

680(22.95)

Yrs of drug use before MMT

15.22(5.06)

14.74(5.00) ^**

15.45(4.88)

14.75(5.12) ^***

mean (SD)

Methadone dosage (mg/day) mean (SD)

51.11(22.05)

44.10(18.94) ^***

52.38(22.17)

45.59(19.98) ^***

Treatment adherence (days), mean (SD)

183.00

36.00

267.00

53.00

(95.00 ~ 183.00)

(14.00 ~ 90.00) ^***

(152.00 ~ 336.00)

(18.00 ~ 143.00) ^***

Longest duration of abstinence (months) median (IQR)

4.00(2.00 ~ 6.00)

0.00(0.00 ~ 1.00) ^***

4.00(2.00 ~ 7.00)

1.00(0.00 ~ 2.75) ^***