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Fig. 2 | BMC Medicine

Fig. 2

From: Risk of bias in observational studies using routinely collected data of comparative effectiveness research: a meta-research study

Fig. 2

The number of studies at risk of bias due to lack of synchronization. Nineteen (25%) studies had a high risk of bias due to the lack of synchronization. Of these, 14 proposed no solution, and 5 used inadequate methods to address the bias. Six studies inadequately reported to enable the assessment of synchronization. Fifty-two (68%) studies had low risk of bias

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