Subgroup analysis and investigation of heterogeneity
If sufficient data are available and significant heterogeneity is identified,
we will undertake the following subgroup analysis: type of
setting (community, hospital, inpatient, outpatient). If substantial
statistical or clinical heterogeneity is detected either by the I2
statistic or by observation, and cannot be explained, we will not
combine study results but will present them in a descriptive summary.