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BMC Medical Research Methodology

Open Access

Erratum to: Bias and precision of methods for estimating the difference in restricted mean survival time from an individual patient data meta-analysis

  • Béranger Lueza1, 2, 3,
  • Federico Rotolo1, 2, 3Email author,
  • Julia Bonastre1, 2,
  • Jean-Pierre Pignon1, 2, 3 and
  • Stefan Michiels1, 2, 3
BMC Medical Research MethodologyBMC series – open, inclusive and trusted201616:71

https://doi.org/10.1186/s12874-016-0154-y

Published: 15 June 2016

The original article was published in BMC Medical Research Methodology 2016 16:37

Erratum

After publication of the original article [1], it came to the authors’ attention that there were errors affecting the equations and Table 3. These corrections were mentioned by the authors during the proofing process, but unfortunately not implemented before final publication.
Table 3

Results for comparisons of methods in estimating the difference in restricted mean survival time (rmstD) in MAC-NPC and MAC-NPC2 meta-analyses

Meta-analysis model

Methods

MAC-NPC

MAC-NPC2

t *  = 5 years

t *  = 10 years

t *  = 5 years

t *  = 10 years

 

rmstD

SE

p-value

rmstD

SE

p-value

rmstD

SE

p-value

rmstD

SE

p-value

 

Naïve Kaplan-Meier

0.20

0.08

0.008

0.51

0.19

0.006

0.17

0.04

<0.001

0.54

0.11

<0.001

Random effects

Pooled Kaplan-Meier

0.17

0.11

0.106

0.49

0.28

0.081

0.20

0.05

<0.001

0.59

0.13

<0.001

Pooled Exponential

0.17

0.09

0.076

0.51

0.29

0.078

0.17

0.03

<0.001

0.55

0.11

<0.001

Peto-quintile

0.23

0.09

0.007

0.55

0.22

0.011

0.21

0.04

<0.001

0.59

0.12

<0.001

Fixed effect

Pooled Kaplan-Meier

0.20

0.07

0.005

0.52

0.18

0.004

0.18

0.04

<0.001

0.59

0.10

<0.001

Pooled Exponential

0.18

0.06

0.003

0.55

0.18

0.002

0.17

0.03

<0.001

0.56

0.09

<0.001

Peto-quintile

0.20

0.07

0.006

0.46

0.16

0.004

0.18

0.04

<0.001

0.53

0.09

<0.001

MAC-NPC Meta-Analysis of Chemotherapy in Nasopharynx Carcinoma, rmstD difference in restricted mean survival time, SE standard error, t * time horizon

Equations 9–11, 14, 18 and 20 were published containing minor typographical errors, affecting subscript characters, special characters and line breaks. These equations have been updated in the original article and, accordingly, references to these equations within the main text have been corrected also.

In Table 3, the distribution of the columns was incorrect. The ‘MAC-NPC’ and ‘MAC-NPC2’ column headings should each have been over two sets of “t *  = 5 years” and “t *  = 10 years” sub-headings. In turn, these sub-headings should have contained 6 columns; the ‘MAC-NPC2’ heading contained 7, an extra ‘rmstD’ column. This has been corrected in the original article.

In addition, the authors noticed an error in Figure 3 which was not submitted at proofing. The vertical dashed line should have crossed the black diamond, representing the overall rmstD, through the center. A correct version of Fig. 3 is now present in the original manuscript and is published in this erratum.
Fig. 3

Forest plot for differences in restricted mean survival time estimated at 10 years using the Pooled Kaplan-Meier method with random effects applied to the MAC-NPC meta-analysis. Each trial is represented by a square, the center of which denotes the difference in restricted mean survival time (rmstD) for that trial comparison, with the horizontal lines showing the 95 % confidence intervals (CI). The size of the square is directly proportional to the amount of information contributed by the trial. The diamond represents the overall rmstD, with the center denoting the rmstD and the extremities the 95 % CI. The rmstDs are expressed in year

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)
Gustave Roussy, Université Paris-Saclay, Service de biostatistique et d’épidémiologie
(2)
Université Paris-Saclay, Univ. Paris-Sud, UVSQ, CESP, INSERM
(3)
Ligue Nationale Contre le Cancer meta-analysis platform, Gustave Roussy

Reference

  1. Lueza B, Rotolo F, Bonastre J, Pignon JP and Michiels S. Bias and precision of methods for estimating the difference in restricted mean survival time from an individual patient data meta-analysis. BMC Med Res Meth. 2016;16:37. doi:10.1186/s12874-016-0137-z.

Copyright

© Lueza et al. 2016

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