Sample Size Calculation for PEFR
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SAMPLE SIZE CALCULATION FOR PEAK EXPIRATORY FLOW RATE AMONG HEALTHY SCHOOL CHILDREN AGED 8-13 YEARS IN PONDICHERRY

Subject Area: Education / Adult Learning / Instructional Design

Modified: 28 July 2025

Peak Expiratory Flow Rate (PEFR) is a valuable monitor of lung function with respect to respiratory health, and detection of obstructive airway diseases, such as asthma. The purpose of this investigation is to measure PEFR in healthy school children ages 8-13 years in Pondicherry. Determining the appropriate sample size is vital for any investigation to ensure the findings are statistically significant and specific to the target population. It is an important step in sample size calculations does to ensure the results are valid for population generalization.

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Sample size calculation

SS = Sample Size 

Z=Z-value (1.96 for a 95% confidence level) 

P=Percentage of population picking a choice 

d=Margin error=0.03 

SS = 682.9 = 683 

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Conclusion:

The calculated sample size of 683 for this study is satisfactory because it has provided a reliable estimate of peak expiratory flow rate among healthy school children aged 8-13 years in Pondicherry at a 95% confidence interval with 3% margin of error. A sample size of this size will make it possible for the study to yield statistically significant results that can be generalized to the larger population of school children living in the Pondicherry region. Using the statistical conventions outlined in this paper will ensure the research study provides relevant data about children’s respiratory health in Pondicherry.

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