A 42-year-old woman with a history of rheumatoid arthritis presents with insidious onset of dyspnea and dry cough over 4 months. Chest X-ray shows bilateral lower lobe interstitial infiltrates. Spirometry reveals: FEV₁ = 68% predicted, FVC = 62% predicted, FEV₁/FVC ratio = 0.88, TLC = 65% predicted, DLCO = 55% predicted. Which of the following best describes the pattern of lung dysfunction?

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