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Heterogeneity assessment and statistical analysis
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The statistical heterogeneity in the results of the included studies was assessed using chi-2 test and quantified by I2 (25). In addition, the between-study variance was estimated using the tau-square statistic (26). Meta-analysis was conducted to obtain a summary measure of prevalence of depression in PLWHA. The random effects model was used to report the results with 95% confidence interval (CI). The Metan Stata module (Stata 11, Stata Corp, College Station, TX, USA) was used for data analysis.
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