Which set of data is NOT consistent with a patient diagnosed with mixed restrictive and obstructive pulmonary defects?

In patients diagnosed with mixed restrictive and obstructive pulmonary defects, you would typically expect to see characteristics from both conditions reflected in their pulmonary function tests.

The forced expiratory volume in 1 second to forced vital capacity (FEV1/FVC) ratio is a key metric: a ratio below the normal range (generally 70% in adults) signifies the presence of obstructive defects. A value of 78% may indicate a mild obstruction, but it does not align with the characteristics one would expect in a mixed defect where the ratio would often be lower due to significant obstruction relative to restrictive components.

The forced expiratory flow from 200 to 1200 mL (FEF 200-1200) percentage is another relevant measure. In obstructive disorders, this flow rate is typically decreased, but in restrictive patterns, it might still be preserved or only slightly diminished. A result of 74% of predicted for this value could be consistent with a mixed defect, as it reflects potentially reduced but still reasonable flow rates.

SVC (slow vital capacity) being at 68% of predicted indicates a restrictive defect, as it suggests reduced lung volume. Similarly, an FEV1 at 75% of predicted also confirms the presence