Table 5

Interpretation of weighed mean differences (WMDs) in relation to minimal important differences (MIDs)

Very large effect (most patients are likely to benefit)WMD equal or above 2 MIDs (WMD > 2MIDs)
Large effect (many patients may benefit)WMD equal or above 1 MID, but below 2 MIDs (1 MID < WMD < 2 MIDs)
Moderate effect (some patients may benefit)WMD above 0.5 MID, but below 1 MID (0.5 MID < WMD < 1 MIDs)
Small effect (most patients are unlikely to benefit)WMD equal or below 0.5 MID (0.5 MID < WMD < 1 MIDs)