2.3. Sample size determination
There were 1793 registered physiotherapists in Bangladesh at the time of our study commenced. Using finite population sample size formula28–30, we have calculated the minimum sample size 317 after considering a 95% confidence interval and 5% marginal error. However, we invited 1000 randomly selected physiotherapists using digital communication tools (e.g. Email, Messenger) for participating in this study. 98 communication account was not either valid or active. However, 639 physiotherapists filled and returned the form (response rate of 70.80%). After considering the inclusion and exclusion criteria, we found 423 data eligible for this study. We have put these final data for analysis in a password encrypted personal computer with a new unidentifiable code number after removing participants’ names and registration digit to ensure confidentiality.