Sample size determination in dental research

Lim,  Hoi-Jeong

doi:2014.52.9.558

J Korean Dent Assoc > Volume 52(9); 2014 > Article

The Journal of The Korean Dental Association 2014;52(9):558-569.
DOI: https://doi.org/10.22974/jkda.2014.52.9.004 Published online September 30, 2014.

치의학 연구에서의 표본크기 산출

임회정

전남대학교 치의학전문대학원 교정학교실, 치의학 연구소

Sample size determination in dental research

Hoi-Jeong Lim

Department of Orthodontics, Chonnam National University School of Dentistry, Dental Science Research Institute

Abstract

Sample size determination is critical, but not easy to do. Sample size defined as the number of observations in a sample to be studied should be big enough to have a high likelihood of detecting a true difference between groups. Practical procedure for determining sample size, using G*power and previous dental articles, was shown in this study. Examples involving independent t-test, paired t-test, one-way analysis of variance(ANOVA), and one-way repeated-measures(RM) ANOVA were used. The purpose of this study is to enable researchers with non-statistical backgrounds to use in practice freely available statistical software G*power to determine sample size and power.

Key Words: sample size;power analysis;dental research;