Table 1.
Diagnostic accuracy of index breathalysers compared with reference police breathalyser, using researcher interpretation of single-use breathalysers
| Breathalyser | Total participants | Correctly positive by reference standard | Correctly negative by reference standard | Sensitivity (%) | Specificity (%) | Positive predictive value (%) | Negative predictive value (%) |
|---|---|---|---|---|---|---|---|
| Alcosense Elite multiuse | 205 | 34/38 | 107/167 | 89.5 (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-use | 108 | 18/19 | 45/89 | 94.7 (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-use | 100 | 5/19 | 79/81 | 26.3 (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.