7.7.3  Data extraction for continuous outcomes

Introductory text

7.7.3.1 Post-intervention versus change from baseline

7.7.3.2  Obtaining standard deviations from standard errors and confidence intervals for group means

7.7.3.3  Obtaining standard deviations from standard errors, confidence intervals, t values and P values for differences in means

7.7.3.4  Transformations and skewed data

7.7.3.5  Medians and interquartile ranges

7.7.3.6  Ranges

7.7.3.7  No information on variability

7.7.3.8  Combining groups

Figure 7.7.a: Formuale for combining groups