Background & Objectives: Peak expiratory flow rate (PEFR) is an effort dependent. It remains at its peak for 10 sec. Peak expiratory flow rate may be affected by some factors affecting the normal function of the respiratory system. Such factors include the body constitution such as height, weight, sex, age etc. A study of peak expiratory flow rate and its relationship with trunk leg ratio. The trunk-leg ratio (TLR) was used in apparently healthy young females of age 10-15 years. A better understanding of the association between Trunk-leg ratio and PEFR may identify those with high chances of respiratory diseases.

Methods: A cross sectional study was conducted in which the peak flow rate of 80 school going girls, aged 10-15 years was measured with a peak flow meter. A peak flow meter and a measuring tape to scale height were used to measure the participants and written consent from  their guardian was obtained before the start of procedure.

 Results: There was no significant correlation between PEFR and trunk to leg ratio and trunk length and PEFR. A low correlation was found between leg length and trunk to leg  ratio.

Interpretation & Conclusion: The study suggest that the trunk to leg ratio has no significance with young girls in this study.