Monitor precision and failure rate by length of time in service
| Service duration, months | Monitors tested, n | Failure rate, % (n) | Mean difference, mmHg (95% CI) |
|---|---|---|---|
| 0–5 | 10 | 10 (1) | 0.38 (−0.19 to 0.95) |
| 6–12 | 17 | 0 (0) | 0.74 (0.30 to 1.17) |
| 13–18 | 11 | 9 (1) | 0.72 (0.17 to 1.26) |
| 19–24 | 9 | 33 (3) | 1.09 (0.49 to 1.69) |
| >24 | 5 | 20 (1) | 1.16 (0.35 to 1.96) |
| Unsurea | 9 | 22 (2) | – |
↵a Unsure refers to when staff were unable to provide evidence or estimate the service duration of a monitor.