Developing a new questionnaire for measuring the prevalence and distribution of asthma

Over the last few years the International Union Against Tuberculosis (IUAT) has been developing a new questionnaire for measuring the prevalence and distribution of asthma. The methods that are being used to establish the validity of the questionnaire are described, along with some preliminary results. These results are used to illustrate a number of problems. Current work concerning the further development and testing of the questionnaire is described.