Open Access

Erratum to: 'Chinese medicine combined with calcipotriol betamethasone and calcipotriol ointment for Psoriasis vulgaris (CMCBCOP): study protocol for a randomized controlled trial'

  • Ze-Huai Wen1, 2,
  • Mei-Ling Xuan1,
  • Yu-Hong Yan3,
  • Xiao-Yan Li1,
  • Dan-Ni Yao3,
  • Geng Li1,
  • Xin-Feng Guo1,
  • Ai-Hua Ou1 and
  • Chuan-Jian Lu3Email author
Trials201617:357

https://doi.org/10.1186/s13063-016-1500-4

Received: 12 July 2016

Accepted: 12 July 2016

Published: 26 July 2016

The original article was published in Trials 2014 15:2172

Erratum

Unfortunately, the original version of this article [1] contained an error. The superiority margin difference should be 5 % instead of 10 %. We performed a superiority test of two independent proportions with superiority margin difference of 5 % by PASS 11.0 software again, and the results were the same as mentioned in the paper before. The sentence in the "Sample size calculation" part (Page 5) is corrected as follows:

According to the supposition and as calculated by PASS 11.0 software (NCSS, LLC, Kaysville, Utah, USA), sample size of 239 in each group can achieve 90 % power and to rule out a two-sided type I error of 5 % to detect a superiority margin difference of 5 % in this two-arm trial with equal allocation in each group.

Notes

Declarations

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Key Unit of Methodology in Clinical Research, Guangdong Provincial Hospital of Chinese Medicine
(2)
National Centre for Design Measurement and Evaluation in Clinical Research, Guangzhou University of Chinese Medicine
(3)
Department of Dermatology, Guangdong Provincial Hospital of Chinese Medicine

Reference

  1. Wen Z-H, Xuan M-L, Yan Y-H, Li X-Y, Yao D-N, Li G, Guo X-F, Ou A-H, Lu C-J. Chinese medicine combined with calcipotriol betamethasone and calcipotriol ointment for Psoriasis vulgaris (CMCBCOP): study protocol for a randomized controlled trial. Trials. 2014;15:294.View ArticlePubMedPubMed CentralGoogle Scholar

Copyright

© Wen et al. 2016

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