Table 2 Subgroup analysis for studies in Iran and other countries
From: The effect of methadone on depression among addicts: a systematic review and meta-analysis
Countries | Number of articles | Sample size | Heterogeneity (I2) | Egger’s test | Mean ± SD of before | Mean ± SD of after |
|---|---|---|---|---|---|---|
Iran | 12 | 327 | 99.7 | 0.053 | 23.9 ± 4.6 | 15.5 ± 3.2 |
Other countries | 7 | 1621 | 99.6 | 0.751 | 27.8 ± 3.8 | 18.4 ± 4.8 |