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Table 4 Agreement of self-reported heroin use and urine drug screens: CCT participants

From: The political and scientific challenges in evaluating compulsory drug treatment centers in Southeast Asia

  

Urine drug screen results

 

Self-report

Negative

Time-points

Negative

Positive

Totals

 

A

B

 

Baseline

n/a

n/a

n/a

T1

60/208 (29%)

27/208 (13%)

87/208 (42%)

T2

57/182 (31%)

17/182 (10%)

74/182 (41%)

T3

46/173 (27%)

20/173 (11%)

66/173 (38%)

T4

54/166 (33%)

19/166 (11%)

73/166 (44%)

Positive

 

C

D

 

Baseline

n/a

n/a

n/a

T1

8/208 (4%)

113/208 (54%)

121/208 (58%)

T2

7/182 (4%)

101/182 (55%)

108/182 (59%)

T3

15/173 (9%)

92/173 (53%)

107/173 (62%)

T4

9/166 (5%)

84/166 (51%)

93/166 (56%)

  1. *The percentage (%) of agreement was calculated based on the number of valid cases, i.e., cases that were not lost-to-follow-up at the corresponding time-point
  2. **The concordance rates were calculated by dividing the number of cases with responses matched by the number of valid cases
  3. Concordance of agreement = A + D:
  4. T1 = 29% + 54% = 83%
  5. T2 = 31% + 55% = 86%
  6. T3 = 27% + 53% = 80%
  7. T4 = 33% + 51% = 84%
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Harm Reduction Journal

ISSN: 1477-7517