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Table 4 Pattern of MMT adherence among MMT patients

From: Adherence to methadone maintenance treatment and associated factors among patients in Vietnamese mountainside areas

Characteristics

MMT duration ≤12 months

MMT duration >12 months

Total

p-value

n

%

n

%

n

%

Number of days missing doses in the last 4 daysa

 • None

91

89.2

128

92.1

219

90.9

0.18

 • 1 day

9

8.8

6

4.3

15

6.2

 

 • 2–4 days

2

2.0

5

3.6

6

2.9

 

Forget to take doses at the last weekendb

 • Yes

5

4.9

6

4.3

11

4.6

0.69

 • No

97

95.1

131

94.2

228

94.6

 

 • Do not remember

0

0.0

2

1.4

2

0.8

 

Last time that missing doses in the last 3 monthsc

 • 1 week ago

9

8.8

5

3.6

14

5.8

<0.01

 • 2 weeks ago

4

3.9

5

3.6

9

3.7

 

 • 3–4 weeks ago

6

5.9

8

5.8

14

5.8

 

 • 1–2 months ago

5

4.9

9

6.5

14

5.8

 

 • 2–3 months ago

5

4.9

34

24.5

39

16.2

 

 • None

70

68.6

67

48.2

137

56.9

 

 • Do not remember

3

2.9

11

7.9

14

5.8

 

Adherence (MoH’s standard)d

 • Sub-optimal adherence

58

56.9

100

71.9

158

65.6

0.02

 • Optimal adherence

44

43.1

39

28.1

83

34.4

 

Adherence (VAS)e

 • Sub-optimal adherence (<90%)

42

43.3

66

50.0

108

47.2

0.32

 • Optimal adherence (≥90%)

55

56.7

66

50.0

121

52.8

 
 

Mean

SD

Mean

SD

Mean

SD

p-value

Self-assessed adherence (VAS)f

92.9

9.5

91.1

11.1

91.9

10.5

0.25††

  1. χ 2 ; fisher’s exact test; †† T-test
  2. aPearson chi-squared test = 2.5157; bFisher’s exact test = 0.688; cPearson chi-squared test = 23.7634;
  3. dPearson chi-squared test = 5.9249; ePearson chi-squared test = 1.0075; fT-test = 1.2880 (df = 227)