Restrictive defect:

Lung diseases

• Diffuse interstitial fibrosis
• Sarcoidosis
• Alveolar proteinosis

Lung resection

• Pneumonectomy

Abdominal distension

• Ascites
• Obesity
• Pregnancy

Chest wall problems

• Kyphoscoliosis
• Scleroderma

Pleural disease

• Pleural effusion
• Pleural fibrosis

The list is incomplete.