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Table 2 Risk of bias assessment of observational studies based on ROBINS-I

From: Global strategies and effectiveness for COVID-19 prevention through contact tracing, screening, quarantine, and isolation: a systematic review

Author and year Bias due to confounding Bias in selection of participants into the study Bias in classification of interventions Bias due to deviations from intended interventions Bias due to missing data Bias in measurement of outcomes Bias in selection of the reported result Overall risk of bias
Matt J 2020 Moderate Low Low Low Moderate Moderate Low Moderate
Hu Z 2020 [15] Moderate Low Low Low Moderate Moderate Low Moderate
Shen 2020 [16] Moderate Low Low Low Moderate Moderate Low Moderate
Lagier 2020 [17] Moderate Low Low Low Moderate Low Low Serious
Cheng 2020 [18] Moderate Moderate Low Low Moderate Moderate Low Moderate
Wang 2020 [19] Moderate Low Low Low Moderate Moderate Low Moderate
Law 2020 [20] Moderate Low Low Low Moderate Moderate Low Moderate
Cheng 2020b [21] Moderate Low Low Low Moderate Moderate Low Moderate
Bai 2020 [22] Moderate Low Low Low Moderate Moderate Low Moderate