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Erratum | Open | Published:

Erratum to: Effects of cyclophosphamide on pulmonary function in patients with scleroderma and interstitial lung disease: a systematic review and meta-analysis of randomized controlled trials and observational prospective cohort studies

The original article was published in Arthritis Research & Therapy 2008 10:R124

It has been brought to our attention that Figure 2b in our recently published paper [1] contains an error. Specifically, we inadvertently entered -6.4 rather than +6.4 for the Nadaskevich paper [2] reported in Figure 2b. Recalculation of the summary estimate for diffusing lung capacity of carbon monoxide (DLCO) in this figure revealed a summary mean difference of 3.74, with 95% confidence interval (0.09 to 7.40). This effect is now statistically significant, although the overall conclusion of our meta-analysis, that cyclophosphamide treatment did not result in clinically significant improvement of pulmonary function, is unchanged by this recalculation, as the improvement remains less than the predefined criterion of 10%. The corrected figure 2b is given here as Figure 1.

Figure 1
figure1

Forest plot of the overall meta-analysis result in the randomized clinical trials. Comparison of the diffusing capacity for carbon monoxide (DLCO) at 12 months for patients with scleroderma lung disease treated with cyclophosphamide versus a control group. See Table 2 [1] for study details. RCT, randomized clinical trial; SE, standard error; CI, confidence interval; Chi2, chi-squared; df, degree of freedom; I2, I-squared; Z, Z value; Mean difference, weighted mean difference; Random, random-effects.

References

  1. 1.

    Nannini C, West CP, Erwin PJ, Matteson EL: Effects of cyclophosphamide on pulmonary function in patients with scleroderma and interstitial lung disease: a systematic review and meta-analysis of randomized controlled trials and observational prospective cohort studies. Arthritis Res Ther. 2008, 10: R124-10.1186/ar2534.

  2. 2.

    Nadashkevich O, Davis P, Fritzler M, Kovalenko W: A randomized unblinded trial of cyclophosphamide versus azathioprine in the treatment of systemic sclerosis. Clin Rheumatol. 2006, 25: 205-212. 10.1007/s10067-005-1157-y.

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Correspondence to Carlotta Nannini.

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The online version of the original article can be found at 10.1186/ar2534

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Authors’ original file for figure 1

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