Table 1

Diagnostic accuracy of index breathalysers compared with reference police breathalyser, using researcher interpretation of single-use breathalysers

BreathalyserTotal participantsCorrectly positive by reference standardCorrectly negative by reference standardSensitivity (%)Specificity (%)Positive predictive value (%)Negative predictive value (%)
Alcosense Elite multiuse20534/38107/16789.5 (75.9 to 95.8)64.1 (56.6 to 71.0)36.2 (27.2 to 46.3)96.4 (91.1 to 98.6)
Dräger Alco-Check single-use10818/1945/8994.7 (75.4 to 99.1)50.6 (40.4 to 60.7)29.0 (19.2 to 41.3)97.8 (88.7 to 99.6)
Alcosense Single single-use1005/1979/8126.3 (11.8 to 48.8)97.5 (91.4 to 99.3)71.4 (35.9 to 91.8)85.0 (76.3 to 90.8)
  • 95% CIs are shown in parentheses.