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Table 3 Agreement in detecting drug use by point-of-care urine drug screen (UDS) and Computer-Assisted Self Interview (CASI)

From: Current drug use and lack of HIV virologic suppression: point-of-care urine drug screen versus self-report

CASI reported 7-day use UDS Kappacoefficient
(+) (−) total
Any drugs (+) 84 (37.3%) 10 (4.4%) 94 (41.8%) 0.59
(−) 37 (16.4%) 94 (41.8%) 131 (58.2%)
Total 121 (53.8%) 104 (46.2%) 225 (100.0%)
Marijuana (+) 57 (25.3%) 8 (3.6%) 65 (28.9%) 0.68
(−) 24 (10.7%) 136 (60.4%) 160 (71.1%)
Total 81 (36.0%) 144 (64.0%) 225 (100.0%)
Cocaine (+) 39 (17.3%) 3 (1.3%) 42 (18.7%) 0.71
  (−) 19 (8.4%) 164 (72.9%) 183 (81.3%)  
  Total 58 (25.8%) 167 (74.2%) 225 (100.0%)  
Opiates (+) 2 (0.9%) 15 (6.7%) 17 (7.6%) 0.05
  (−) 15 (6.7%) 193 (85.8%) 208 (92.4%)  
  Total 17 (7.6%) 208 (92.4%) 225 (100.0%)  
Methamphetamine (+) 0 (0.0%) 4 (1.8%) 4 (1.8%) −0.01
  (−) 5 (2.2%) 216 (96.0%) 221 (98.2%)  
  Total 5 (2.2%) 220 (97.8%) 225 (100.0%)  
  1. Note: CI: confidence interval; (+): positive screen or reported use; (−): negative screen or reported no use.