Table 1. Sample size calculation by using different variables.

S.no	Associated factors	Assumptions	The final sample size
1	BMI (body mass index)	Power = 80%, Ratio = 1:1, Outcome in unexposed group = 12.52%, AOR = 2.7, Outcome in exposed group = 27.9% and adding 10% non-response rate and with design effect of 2.	524
2	Alcohol drinking	Power = 80%, Ratio = 1:1, Outcome in unexposed group = 20.37%, AOR = 2.9, Outcome in exposed group = 42.6% and adding 10% non-response rate and with design effect of 2.	338