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.