Sample-size calculation for repeated-measures and longitudinal studies

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Presentation transcript:

Sample-size calculation for repeated-measures and longitudinal studies Yi Guo, Nikolaos Pandis American Journal of Orthodontics and Dentofacial Orthopedics Volume 147, Issue 1, Pages 146-149 (January 2015) DOI: 10.1016/j.ajodo.2014.10.009 Copyright © 2015 American Association of Orthodontists Terms and Conditions

Fig Illustration of an interaction between the treatment and the trend of overjet. The graph shows that the 2 lines are not parallel, indicating a treatment-by-time interaction. On the y-axis, on average the control and the treatment groups start with similar average overjets; however, with time, the reduction in overjet is greater in the treatment group compared with the control group. American Journal of Orthodontics and Dentofacial Orthopedics 2015 147, 146-149DOI: (10.1016/j.ajodo.2014.10.009) Copyright © 2015 American Association of Orthodontists Terms and Conditions