Relationships between daytime PaCO2 and clinic SpO2, 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 PaCO2 | BMI (kg/m2) | 0.254 | 0.005 | 0.218 | 0.004 | 0.351 | 0.001 |
| SpO2 (%) | −0.555 | <0.001 | −0.487 | <0.001 | −0.426 | <0.001 | |
| FVC | −0.429 | <0.001 | −0.487 | <0.001 | −0.472 | <0.001 | |
BMI, body mass index; FVC, forced vital capacity; PaCO2, arterial partial pressure of carbon dioxide; SpO2, oxygen saturation.