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Sample size and sampling procedure

KS Kyu Kyu Swe
AS Aung Kyaw Soe
SA Saw Htun Aung
HS Htin Zaw Soe
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The sample size was calculated by n = (zα + z1-β)2 (pc qc + pe qe) /d2 + 2/d + 2 = (1.96 + 1.0364)2 (0.47 × 0.53 + 0.69 × 0.31)/(0.22)2 + 2/(0.22) + 2 with 85% power and 5% type one error rate. A drop-out rate of 10% for each group was considered. The hypothesized proportions of twice-daily tooth brushing practice after lecturing in the control group and intervention groups were 47% and 69%, respectively [11]. The sample size for each group was 110 and the total sample size was 220. Prior to conducting the study, permission was obtained from the Township Educational Officer and Township Medical Officer. Out of a total of 47 BEMSs in Magway Township, there were only four in urban areas. To obtain the required sample, in the first stage, two BEMSs from rural areas and in the second stage, 110 students from each school, were randomly selected.

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