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Growth in height and weight was studied cross-sectionally in 500 Hungarian and 607 Belgian asthmatic boys aged 3 to 16 years. Similar patterns of growth were obtained in both samples, revealing a greater sensitivity towards growth inhibiting factors during adolescence than during childhood. Weight was generally more affected than height. Factors such as the degree of seriousness of the respiratory disease, specific medical diagnosis and steroid therapy seemed to have their specific growth retard­ing effect. These factors acted separately, while being significantly associated in their occurence. The duration of the disease did not influence growth directly.