Table 2.
False positive measurements for hypoxaemia by analytical sample and percentile threshold
| Analytical sample | 2.5th percentile SpO2 threshold | 5th percentile SpO2 threshold | 10th percentile SpO2 threshold | ||||
| Age in months | SpO2 | False positive, n/N (%) | SpO2 | False positive, n/N (%) | SpO2 | False positive, n/N (%) | |
| 1 | All | 91% | 40/1470 (2.7) | 92% | 76/1470 (5.1) | 94% | 179/1470 (12.1) |
| 3–11 | 92% | 20/445 (4.4) | 93% | 34/445 (7.6) | 94% | 52/445 (11.6) | |
| 12–23 | 91% | 17/567 (2.9) | 92% | 35/567 (6.1) | 94% | 83/567 (14.6) | |
| 24–35 | 91% | 13/458 (2.8) | 93% | 29/458 (6.3) | 95% | 72/458 (15.7) | |
| 2 | All | 91% | 51/1865 (2.7) | 92% | 107/1865 (5.7) | 94% | 248/1865 (13.2) |
| 3–11 | 91% | 16/615 (2.6) | 92% | 33/615 (5.3) | 94% | 85/615 (13.8) | |
| 12–23 | 91% | 21/673 (3.1) | 92% | 44/673 (6.5) | 93% | 68/673 (10.1) | |
| 24–35 | 91% | 14/577 (2.4) | 92% | 30/577 (5.1) | 94% | 60/577 (10.3) | |
| 3 | All | 91% | 55/2022 (2.7) | 92% | 119/2022 (5.8) | 94% | 273/2022 (13.5) |
| 3–11 | 91% | 18/634 (2.8) | 92% | 35/634 (5.5) | 94% | 88/634 (13.8) | |
| 12–23 | 91% | 21/698 (3.0) | 92% | 48/698 (6.8) | 93% | 72/698 (10.3) | |
| 24–35 | 92% | 36/690 (5.2) | 92% | 36/690 (5.2) | 94% | 76/690 (11.0) | |
SpO2, peripheral arterial oxyhaemoglobin saturation.