Monitor precision and failure rate by amount of usage, head office data
| Category of usage | Annual usage rate | Pharmacies where monitors tested, n | Failure rate, % (n) | Mean difference, mmHg (95% CI) |
|---|---|---|---|---|
| High | 116–275.5 | 13 | 31 (4) | 1.22 (0.72 to 1.71) |
| Medium high | 86.5–108.5 | 10 | 10 (1) | 0.87 (0.34 to 1.41) |
| Medium low | 60.5–82.5 | 13 | 15 (2) | 0.78 (0.32 to 1.24) |
| Low | 13.5–59.5 | 16 | 6 (1) | 0.47 (0.04 to 0.90) |
Data available only at level of pharmacy (four failures happened in pharmacies where multiple devices were being used, making it difficult to interpret the relationship with usage).