Journal
AUSTRALIAN & NEW ZEALAND JOURNAL OF OBSTETRICS & GYNAECOLOGY
Volume 63, Issue 3, Pages 469-472Publisher
WILEY
DOI: 10.1111/ajo.13656
Keywords
corticosteroid; epidemiology; preterm birth; relative risk; statistics
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Treatment effects can be measured on relative or absolute scale. Differences in baseline risk between subgroups can lead to different treatment effects on at least one scale. Considering both relative and absolute effects is important for identifying meaningful subgroup differences.
Treatment effects can be measured on the relative scale (eg, risk ratios, odds ratios) or the absolute scale (eg, risk differences). If the baseline risk of an outcome is different between subgroups, the effect of the treatment will differ between subgroups on at least one scale (relative, absolute, or both). We illustrate this using two examples from the literature where only relative effects were estimated, but conclusions about subgroup differences would likely have changed had absolute effects also been considered. To identify all meaningful subgroup differences, researchers and clinicians should compare effects on the relative and absolute scale.
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