Research & Statistics
Sample Size Calculator for Physiotherapy Research
Sample size calculation is a critical step in physiotherapy research design. This calculator helps students and researchers determine the minimum number of participants needed for statistically valid results.
Formula
n = (Z² × p × q) / e² where Z=confidence level, p=proportion, e=margin of error
Normal Range
Common: 95% confidence (Z=1.96), 5% margin of error, 50% proportion = n≈385
Clinical Use
BPT/MPT research projects, clinical trials, outcome studies, evidence-based practice.
Use the Calculator
Enter patient values and get instant AI-powered clinical interpretation.