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Breath-alcohol analysers grouped according to time after latest calibration. This structuring is applied to the data in Figure 1
| Model | Time after latest calibration/analyser (n) | sum | ||
|---|---|---|---|---|
| < 2 months (1) | 2-4 months (2) | > 4 months (3) | ||
| SD-400Touch | 30 | 25 | 15 | 70 |
