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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'

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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.

Reference

  1. 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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Author information

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, Z., Xuan, M., Yan, Y. 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) doi:10.1186/s13063-016-1500-4

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