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Linear regression comparing pre-bronchoalveolar lavage (BAL) arterial partial pressure of oxygen-to-fractional inspired oxygen ratio (P:F, x-axis) with thoracic computed tomography (CT) disease severity score (y-axis). There was a statistically significant linear correlation found between pre-BAL P:F and CT disease severity scores, where for each unit change in pre-BAL P:F, 43% of the variation in CT score could be predicted (p = 0.0042).
