In this study, respiratory functions were applied on 20 patients (10 boys and 10 girls) with juvenile diabetes mellitus and 20 healthy subjects (10 boys and 10 girls) followed up for 2.5, SD 1.29 years on the average. Vital capacity (VC), maximal voluntary ventilation (MVV), forced volume in 1 second (FEV 1) and mean forced expiratory flow during the middle half of the FVC (FEF 25-75) parameter…