Question in 1972 questionnaire	Respiratory symptom in our study
8	Do you usually cough and clear your throat in the morning?	Cough symptoms
9	Do you usually cough during the day?
10	When you cough or clear your throat,do you usually bring up phlegm?
11	Do you have cough for 3 months or more altogether during a year?
12	During the last 2 years, have you had a cough and/or phlegm in connection with a cold for more than 3 weeks?	Asthma-like symptoms
17	Do you have attacks of breathlessness?
18	Have you ever had wheezing in your chest?
13	Are you more breathless than people of your own age when walking uphill?	Moderate dyspnoea on exercise
14	Are you breathless when you climb two flights of stairs at an ordinary pace?
15	Are you breathless when you walk on level ground at an ordinary pace?	Severe dyspnoea on exercise
16	Are you breathless when at rest?