Table 1.
Heterogeneity statistics for examples of meta-analyses from the literature. Meta-analyses were conducted using either meta or metan in STATA15
| Heterogeneity test | |||||||
|---|---|---|---|---|---|---|---|
| Topic | Outcome/analysis | Effect measure | No of studies | Q | df | P | I2(95% uncertainty interval)* |
| Tamoxifen for breast cancer16 | Mortality | Peto odds ratio | 55 | 55.9 | 54 | 0.40 | 3 (0 to 28) |
| Streptokinase after myocardial infarction17 | Mortality | Odds ratio | 33 | 39.5 | 32 | 0.17 | 19 (0 to 48) |
| Selective serotonin reuptake inhibitors for depression13 | Drop-out | Odds ratio | 135 | 179.9 | 134 | 0.005 | 26 (7 to 40) |
| Magnesium for acute myocardial infarction18 | Death | Odds ratio | 16 | 40.2 | 15 | 0.0004 | 63 (30 to 78) |
| Magnetic fields and leukaemia19 | All studies | Odds ratio | 6 | 15.9 | 5 | 0.007 | 69 (26 to 87) |
| Amantadine11 | Prevention of influenza | Odds ratio | 8 | 12.44 | 7 | 0.09 | 44 (0 to 75) |
df=degrees of freedom.
*
Values of I2 are percentages. 95% uncertainty intervals are calculated as proposed by Higgins and Thompson.14