title: Statistical applications in orthodontics. Part III. How large a study is needed?
authors.affiliation: UWCM, Cardiff, Wales, UK.
authors.forename: R G
authors.initials: RG
authors.lastname: Newcombe
mesh_terms: D016009:Chi-Square Distribution; D016001:Confidence Intervals; D006801:Humans; D009970:Orthodontics / Q000706:statistics & numerical data*; D011336:Probability; D012107:Research Design / Q000706:statistics & numerical data; D018401:Sample Size