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Evidence of selection bias in preterm survival studies: a systematic review
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  • Published on: 9 January 2022
    Selection bias in preterm survival studies
    Dear Editor,

    The systematic review by Evans and Levine[1] identifies sources of selection bias in reporting preterm survival and recommends cohort characteristics, which should be defined to avoid bias in future studies. To these should be added the more fundamental source of confounding; that of lack of uniformity in defining a ‘live birth’, particularly around the margins of viability. Statute law does not consiste...

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    Conflict of Interest:
    None declared.
  • Published on: 9 January 2022
    Treatment decisions and survival data

    Dear Editor,

    Evans and Levene have endeavoured to review the published survival data for infants born at less than 28 weeks, to identify bias and to make recommendations facilitating more accurate comparison of the published survival rates [1].

    Practices regarding resuscitation vary between institutions and may change over time. In one study from a large regional centre in British Columbia, not includ...

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    Conflict of Interest:
    None declared.