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7.7.3  Data extraction for continuous outcomes

Introductory text Post-intervention versus change from baseline  Obtaining standard deviations from standard errors and confidence intervals for group means  Obtaining standard deviations from standard errors, confidence intervals, t values and P values for differences in means  Transformations and skewed data  Medians and interquartile ranges  Ranges  No information on variability  Combining groups

Figure 7.7.a: Formuale for combining groups