“…The study region also varied, with 6 research investigating both urban and rural areas, 12 - 15 ,17,18 while the other 1 study did not offer this figure. 16 Three surveys utilized a stratified multistage random sampling method to recruit participants and gather demographic data, 12 , 13 , 17 while 2 used convenience sampling, 14 , 18 2 did not specify particular sampling techniques. 15 , 16 Three researches shown both males and females in their analyses, 12 , 13 , 17 100% of participants were pregnant female at hospitals among 3 researches 14 , 15 , 18 , 1 study has not yet provided a sex ratios among non-smokers.…”