| ANCOVA | Analysis of covariance |
| AP | Anteroposterior |
| ASA | American Society of Anesthesiologists |
| BMI | Body mass index |
| CC | Craniocaudal |
| CI | Confidence interval |
| CSA | Cross-sectional area |
| IQR | Interquartile range |
| PCV | Pressure-controlled ventilation |
| SD | Standard deviation |
| VCV | Volume-controlled ventilation |
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