Failure rate by approximate purchase price of monitor
| Purchase price, £ | Pass | Monitor pass, cuff fail, n | All monitor pass, n (%)a | Monitor fail, n (%a) | All fail, n (%) | Total, n |
|---|---|---|---|---|---|---|
| 0–10 | 27 | 0 | 27 (66) | 14 (34) | 14 (34) | 41 |
| 11–20 | 77 | 10 | 87 (87) | 13 (13) | 23 (23) | 100 |
| 21–30 | 40 | 3 | 43 (91) | 4 (9) | 7 (15) | 47 |
| >31 | 41 | 8 | 49 (94) | 3 (6) | 11 (21) | 52 |
| Total | 185 | 21 | 206 | 34 | 55 | 240 |
| Full breakdown for monitors costing >£30 | ||||||
| 31–40 | 13 | 1 | 14 | 1 | 2 | 15 |
| 41–50 | 8 | 3 | 11 | 1 | 4 | 12 |
| 51–60 | 8 | 2 | 10 | 0 | 2 | 10 |
| 61–70 | 2 | 0 | 2 | 0 | 0 | 2 |
| 71–80 | 3 | 2 | 5 | 1 | 3 | 6 |
| 81–90 | 1 | 0 | 1 | 0 | 0 | 1 |
| 91–100 | 5 | 0 | 5 | 0 | 0 | 5 |
| >100 | 1 | 0 | 1 | 0 | 0 | 1 |
↵a Percentage of total monitors by purchase-price classification.