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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