A. False The normal is about 85 per cent at age 20, falling to about 70 per cent at age 60–70.
B. True The airways are not obstructed and vital capacity volume is reduced.
C. True Females have, on average, smaller vital capacities than males.
D. True This is typical of moderately severe obstructive airways ***.
E. True 200 litres/min is a low figure; most subjects, other than small elderly females, should do better.