Sample Size Estimation for SLE Patients

For sample size calculation and power analysis we considered data concerning physical inactivity and low weekly exercise previously reported in SLE patients [24 (link), 25 (link)]. Setting a significance level of 0.05 (alpha), power at 80% (beta), an Expected proportion of 0.3, and a total wight of confidence intervals of 0.2, we estimated a saple size of 88 subjects to assess the confidence intervals for proportion. Sample size calculation and power analysis were performed using SAS University Edition, SAS Institute Inc., SAS Campus Drive, Cary, North Carolina 27513, USA.

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Margiotta D.P., Basta F., Dolcini G., Batani V., Lo Vullo M., Vernuccio A., Navarini L, & Afeltra A. (2018). Physical activity and sedentary behavior in patients with Systemic Lupus Erythematosus. PLoS ONE, 13(3), e0193728.

Publication 2018

SAS University Edition SAS Campus Drive

Patients

Corresponding Organization : Università Campus Bio-Medico

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Variable analysis

independent variables

No independent variables explicitly mentioned.

dependent variables

No dependent variables explicitly mentioned.

control variables

Significance level (alpha) set at 0.05
Power (beta) set at 80%
Expected proportion set at 0.3
Total width of confidence intervals set at 0.2

controls

No positive or negative controls specified by the authors.

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