"Cross-sectional" stepped wedge designs always reduce the required sample size when there is no time effect

doi:10.1016/j.jclinepi.2016.12.011

Comment

. 2017 Mar:83:108-109.

doi: 10.1016/j.jclinepi.2016.12.011. Epub 2017 Jan 16.

"Cross-sectional" stepped wedge designs always reduce the required sample size when there is no time effect

Xin Zhou¹, Xiaomei Liao², Donna Spiegelman³

Affiliations

¹ Departments of Epidemiology and Biostatistics, Harvard T.H. Chan School of Public Health, 677 Hungtington Avenue, Boston, MA 02115, USA. Electronic address: stxzh@channing.harvard.edu.
² AbbVie Inc., Data and Statistical Sciences, 1 North Waukegan Road, North Chicago, IL 60064, USA.
³ Departments of Epidemiology and Biostatistics, Harvard T.H. Chan School of Public Health, 677 Hungtington Avenue, Boston, MA 02115, USA.

PMID: 28093263
PMCID: PMC5517056
DOI: 10.1016/j.jclinepi.2016.12.011

Comment

"Cross-sectional" stepped wedge designs always reduce the required sample size when there is no time effect

Xin Zhou et al. J Clin Epidemiol. 2017 Mar.

. 2017 Mar:83:108-109.

doi: 10.1016/j.jclinepi.2016.12.011. Epub 2017 Jan 16.

Authors

Xin Zhou¹, Xiaomei Liao², Donna Spiegelman³

Affiliations

¹ Departments of Epidemiology and Biostatistics, Harvard T.H. Chan School of Public Health, 677 Hungtington Avenue, Boston, MA 02115, USA. Electronic address: stxzh@channing.harvard.edu.
² AbbVie Inc., Data and Statistical Sciences, 1 North Waukegan Road, North Chicago, IL 60064, USA.
³ Departments of Epidemiology and Biostatistics, Harvard T.H. Chan School of Public Health, 677 Hungtington Avenue, Boston, MA 02115, USA.

PMID: 28093263
PMCID: PMC5517056
DOI: 10.1016/j.jclinepi.2016.12.011

No abstract available

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Comment on

Stepped wedge designs could reduce the required sample size in cluster randomized trials.
Woertman W, de Hoop E, Moerbeek M, Zuidema SU, Gerritsen DL, Teerenstra S. Woertman W, et al. J Clin Epidemiol. 2013 Jul;66(7):752-8. doi: 10.1016/j.jclinepi.2013.01.009. Epub 2013 Mar 22. J Clin Epidemiol. 2013. PMID: 23523551
The stepped wedge cluster randomized trial always requires fewer clusters but not always fewer measurements, that is, participants than a parallel cluster randomized trial in a cross-sectional design. In reply.
de Hoop E, Woertman W, Teerenstra S. de Hoop E, et al. J Clin Epidemiol. 2013 Dec;66(12):1428. doi: 10.1016/j.jclinepi.2013.07.008. Epub 2013 Sep 8. J Clin Epidemiol. 2013. PMID: 24021612 No abstract available.
The efficiency of stepped wedge vs. cluster randomized trials: stepped wedge studies do not always require a smaller sample size.
Hemming K, Girling A. Hemming K, et al. J Clin Epidemiol. 2013 Dec;66(12):1427-8. doi: 10.1016/j.jclinepi.2013.07.007. Epub 2013 Sep 10. J Clin Epidemiol. 2013. PMID: 24035495 No abstract available.

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References

1. Woertman W, de Hoop E, Moerbeek M, Zuidema SU, Gerritsen DL, Teerenstra S. Stepped wedge designs could reduce the required sample size in cluster randomized trials. J Clin Epidemiol. 2013;66:752–8. - PubMed
1. Hemming K, Girling A. The efficiency of stepped wedge vs. cluster randomized trials: stepped wedge studies do not always require a smaller sample size. J Clin Epidemiol. 2013;66:1427–8. - PubMed
1. de Hoop E, Woertman W, Teerenstra S. The stepped wedge cluster randomized trial always requires fewer clusters but not always fewer measurements, that is, participants than a parallel cluster randomized trial in a cross-sectional design. In Reply J Clin Epidemiol. 2013;66:1428. - PubMed
1. Hussey MA, Hughes JP. Design and analysis of stepped wedge cluster randomized trials. Contemp Clin Trials. 2007;28:182–91. - PubMed
1. Walsh F, Bärnighausen T, Delva W, Fleming Y, Khumalo G, Lejeune C, et al. Impact of early initiation versus national standard of care of antiretroviral therapy in Swaziland’s public sector health system: a stepped-wedge randomized implementation study. 2016 Under review. - PMC - PubMed

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[1] Woertman W, de Hoop E, Moerbeek M, Zuidema SU, Gerritsen DL, Teerenstra S. Stepped wedge designs could reduce the required sample size in cluster randomized trials. J Clin Epidemiol. 2013;66:752–8. - PubMed

[2] Woertman W, de Hoop E, Moerbeek M, Zuidema SU, Gerritsen DL, Teerenstra S. Stepped wedge designs could reduce the required sample size in cluster randomized trials. J Clin Epidemiol. 2013;66:752–8. - PubMed

[3] Hemming K, Girling A. The efficiency of stepped wedge vs. cluster randomized trials: stepped wedge studies do not always require a smaller sample size. J Clin Epidemiol. 2013;66:1427–8. - PubMed

[4] Hemming K, Girling A. The efficiency of stepped wedge vs. cluster randomized trials: stepped wedge studies do not always require a smaller sample size. J Clin Epidemiol. 2013;66:1427–8. - PubMed

[5] de Hoop E, Woertman W, Teerenstra S. The stepped wedge cluster randomized trial always requires fewer clusters but not always fewer measurements, that is, participants than a parallel cluster randomized trial in a cross-sectional design. In Reply J Clin Epidemiol. 2013;66:1428. - PubMed

[6] de Hoop E, Woertman W, Teerenstra S. The stepped wedge cluster randomized trial always requires fewer clusters but not always fewer measurements, that is, participants than a parallel cluster randomized trial in a cross-sectional design. In Reply J Clin Epidemiol. 2013;66:1428. - PubMed

[7] Hussey MA, Hughes JP. Design and analysis of stepped wedge cluster randomized trials. Contemp Clin Trials. 2007;28:182–91. - PubMed

[8] Hussey MA, Hughes JP. Design and analysis of stepped wedge cluster randomized trials. Contemp Clin Trials. 2007;28:182–91. - PubMed

[9] Walsh F, Bärnighausen T, Delva W, Fleming Y, Khumalo G, Lejeune C, et al. Impact of early initiation versus national standard of care of antiretroviral therapy in Swaziland’s public sector health system: a stepped-wedge randomized implementation study. 2016 Under review. - PMC - PubMed

[10] Walsh F, Bärnighausen T, Delva W, Fleming Y, Khumalo G, Lejeune C, et al. Impact of early initiation versus national standard of care of antiretroviral therapy in Swaziland’s public sector health system: a stepped-wedge randomized implementation study. 2016 Under review. - PMC - PubMed

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"Cross-sectional" stepped wedge designs always reduce the required sample size when there is no time effect

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"Cross-sectional" stepped wedge designs always reduce the required sample size when there is no time effect

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