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

Trials volume 17, Article number: 357 (2016) Cite this article

The Original Article was published on 22 July 2014

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.

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.

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Authors and Affiliations

  1. Key Unit of Methodology in Clinical Research, Guangdong Provincial Hospital of Chinese Medicine, 111 Dade Road, Guangzhou, 510120, China

    Ze-Huai Wen, Mei-Ling Xuan, Xiao-Yan Li, Geng Li, Xin-Feng Guo & Ai-Hua Ou

  2. National Centre for Design Measurement and Evaluation in Clinical Research, Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou, 510405, China

    Ze-Huai Wen

  3. Department of Dermatology, Guangdong Provincial Hospital of Chinese Medicine, 111 Dade Road, Guangzhou, 510120, China

    Yu-Hong Yan, Dan-Ni Yao & Chuan-Jian Lu

Authors
  1. Ze-Huai Wen
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  2. Mei-Ling Xuan
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  3. Yu-Hong Yan
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  4. Xiao-Yan Li
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  5. Dan-Ni Yao
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  6. Geng Li
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  7. Xin-Feng Guo
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  8. Ai-Hua Ou
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  9. Chuan-Jian Lu
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Corresponding author

Correspondence to Chuan-Jian Lu.

Additional information

The online version of the original article can be found under doi:10.1186/1745-6215-15-294.

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Wen, ZH., Xuan, ML., Yan, YH. et al. Erratum to: 'Chinese medicine combined with calcipotriol betamethasone and calcipotriol ointment for Psoriasis vulgaris (CMCBCOP): study protocol for a randomized controlled trial'. Trials 17, 357 (2016). https://doi.org/10.1186/s13063-016-1500-4

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

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ISSN: 1745-6215