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Grading criteria used by the British Society of Hypertension.1 Grades represent the cumulative percentage of readings falling within 5 mm Hg, 10 mm Hg, and 15 mm Hg of the mercury standard. All three percentages must be greater than or equal to the values shown for a specific grade to be awarded. Values are mm Hg
| Absolute difference between standard and test device (%)
|
|||
|---|---|---|---|
| Grade | ⩽5 | ⩽10 | ⩽15 |
| A | 60 | 85 | 95 |
| B | 50 | 75 | 90 |
| C | 40 | 65 | 85 |
| D | Worse than C | ||
