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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