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Individual participant data meta-analysis of prognostic factor studies: state of the art?

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Figure

Figure 1 An IPD meta-analysis of whether microvessel density is a prognostic factor for death in patients with non-metastaticsurgically treated non-small-cell lung carcinoma, as undertaken by Trivella et al
Table 1 Summary of the data extraction form involving 58 questions, which was used to extract information about the20 IMPF projects examined in detail
Figure 2 Details of the search and classification of IMPF articles.
Figure 3 Number of published IMPF articles over time (NB no articles were identified in 2009 up to the start of March, when ourreview was conducted); the spike in 2007 is due to eight articles [28–35] from the IMPACT collaboration being publishedsimultaneously within the Journal of Neurotrauma.
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