title: Sample size determination in clinical research: 2.
abstract: In the second of this two-part series, comparative study design is considered and, using examples, power calculation is explained. The information required for calculating sample size for comparative studies is highlighted.
authors.affiliation: Lyme Brook Mental Health Centre, Newcastle.
authors.forename: L
authors.initials: L
authors.lastname: Ogundipe
mesh_terms: D003627:Data Interpretation, Statistical; D006801:Humans; D015203:Reproducibility of Results; D012107:Research Design; D018401:Sample Size