Characteristics and SpO2 distribution of three analytical samples
| Characteristic | Analytical sample 1 (primary)* | Analytical sample 2† | Analytical sample 3‡ | |||||||||
| All N=1470 | 3–11 months N=445 | 12–23 months N=567 | 24–35 months N=458 | All N=1865 | 3–11 months N=615 | 12–23 months N=673 | 24–35 months N=577 | All N=2022 | 3–11 months N=634 | 12–23 months N=698 | 24–35 months N=690 | |
| Age in months, mean (SD) | 18.6 (9.5) | 7.3 (2.4) | 18.0 (3.3) | 30.3 (3.2) | 18.2 (9.6) | 7.2 (2.5) | 18.0 (3.3) | 30.2 (3.2) | 18.7 (9.7) | 7.2 (2.5) | 18.0 (3.3) | 30.1 (3.2) |
| Females, n (%) | 697 (47.4%) | 203 (45.6%) | 274 (48.3%) | 220 (48.0%) | 904 (48.4%) | 293 (47.6%) | 332 (49.3%) | 279 (48.3%) | 988 (48.8%) | 302 (47.6%) | 348 (49.8%) | 338 (48.9%) |
| SpO2, 95th percentile | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| SpO2, 75th percentile | 99% | 99% | 99% | 99% | 99% | 99% | 99% | 99% | 99% | 99% | 99% | 99% |
| SpO2, 50th percentile | 98% | 97% | 98% | 98% | 98% | 97% | 97% | 98% | 98% | 97% | 97% | 98% |
| SpO2, 25th percentile | 96% | 96% | 96% | 96% | 96% | 96% | 96% | 96% | 96% | 96% | 96% | 96% |
| SpO2, 10th percentile | 94% | 94% | 94% | 95% | 94% | 94% | 93% | 94% | 94% | 94% | 93% | 94% |
| SpO2, fifth percentile | 92% | 93% | 92% | 93% | 92% | 92% | 92% | 92% | 92% | 92% | 92% | 92% |
| SpO2, 2.5th percentile | 91% | 92% | 91% | 91% | 91% | 91% | 91% | 91% | 91% | 91% | 91% | 92% |
| SpO2, range | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% | 90%–100% |
SpO2 indicates peripheral arterial oxyhaemoglobin saturation.
*Kruskal-Wallis test comparing SpO2 by age category; p=0.0387.
†Kruskal-Wallis test comparing SpO2 by age category; p=0.0095.
‡Kruskal-Wallis test comparing SpO2 by age category; p=0.0401.
SpO2, peripheral arterial oxyhaemoglobin saturation.