Vital capacity is decreased, timed vital capacity (FEV 1.0 %) is normal in:
Vital capacity and timed vital capacity (TVC) are reduced greatly in respiratory diseases like Asthma, Emphysema, Pneumonia, etc.
In scoliosis, vital capacity is reduced, but TVC is normal.
Bronchial asthma
Scoliosis
Chronic bronchitis
Acute bronchitis