Material and Methods-In this cross sectional study with convenient sampling during 2013 winter, we have a total 40 girls, 7- 12, from Esfahan CBD and 40 from the city of Tiran, a small and calm city 45 Km. west of Esfahan with nearly same climate. For every participant we complete the questionnaire for anthropomorphic values and past year respiratory symptoms. For spirometry evaluation we used a Spirolab 3.Datae analyzed by SPSS version 20.
Results-For Esfahan and Tiran girls age was 9.4+/-1.6 against 9.9+/-1.3, for height 135.5+/-10.6 against 140.5+/-11, for weight 31.8+/-11.3 against 34.8+/-13.8 and for BMI 16.4+/-3.1 against 17.2+/-4.7 which are near to each other. For main respiratory symptoms, cough 18.2% against 6% (P-value=0.53), dyspnea 14% against 5(P-value=0.08) and wheezing 3 person against zero. For spirometry indexes, for vital capacity (VC) percent 114.1+/-34.9 against 87.2+/-16.7(P-value=0.000), FVC 2.0+/- 0.6 against 2.1+/-0.7(P-value=0.56), FEV1 1.59+/- 0.39 against 1.83+/-049(P-value=0.15), for FEV1/VC 76.48+/-25.2 against 94.52+/-13.3, for FEF 25 75 1.81+/- 0.62 against 2.61+/- 2.20(P- value= 0.000).
Conclusion- Quality of respiratory air differ normal physiological indexes even in childhood. Some of them are probably compensatory like VC, but others are capable to limit normal activities step by step.