This is an archived version. For the current version, please go to

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