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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)