Relationships between SpO2 and daytime PaCO2, body composition and lung volume at different levels of BMI
| BMI>30 kg/m2 n=245 | BMI>40 kg/m2 n=176 | BMI>50 kg/m2 n=84 | |||||
|---|---|---|---|---|---|---|---|
| r | p Value | r | p Value | r | p Value | ||
| Correlation with clinic SpO2 | BMI | −0.219 | 0.001 | −0.16 | 0.034 | −0.07 | 0.528 |
| PaCO2 | −0.555 | <0.001 | −0.487 | <0.001 | −0.426 | <0.001 | |
| FVC | 0.429 | <0.001 | 0.374 | <0.001 | 0.367 | 0.001 | |
BMI, body mass index; FVC, forced vital capacity; PaCO2, arterial partial pressure of carbon dioxide; SpO2, oxygen saturation.