Table 1.
Error Category Criteria and Mean Differences for Test Device and Observer Readings by Age, Sex and First Measurement Order
| Variables | Error Categories | Mean Difference (mmHg) | SD (mmHg) | P value* | |||
|---|---|---|---|---|---|---|---|
| ≤5 mmHg | ≤10 mmHg | ≤15 mmHg | |||||
| Required | Two of | ≥65% | ≥80% | ≥95% | 5 | 8 | NA |
| All of | ≥60% | ≥75% | ≥90% | 5 | 8 | ||
| Achieved | SBP | 26.8% | 55.6% | 79.6% | 8.02 | 13.1 | NA |
| DBP | 39.6% | 69.2% | 81.6% | 2.2 | 11.3 | NA | |
| Age | P value* | ||||||
| SBP | ≤50 | 23.4% | 53.9% | 77.3% | 7.7 | 10.9 | 0.7 |
| >50 | 30.3% | 57.4% | 82% | 8.3 | 15.1 | ||
| DBP | ≤50 | 38.3% | 70.3% | 82.8% | 1.3 | 10.3 | 0.2 |
| >50 | 41% | 68% | 80.3% | 3.06 | 12.2 | ||
| Gender | |||||||
| SBP | Male | 28.8% | 57.6% | 81.2% | 9.4 | 13.7 | 0.03 |
| Female | 22.5% | 51.3% | 76.3% | 5.8 | 11.9 | ||
| DBP | Male | 45.3% | 75.9% | 83.5% | 1.2 | 11 | 0.08 |
| Female | 27.5% | 55% | 77.5% | 3.7 | 11.6 | ||
Note: *Statistical significance based on the independent t-test for Mean difference.
Abbreviations: SBP, systolic blood pressure; DBP, diastolic blood pressure; NA, not available.