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Table 2 Information you may wish to consider including on the data extraction form (will vary depending on the research question being addressed)

From: How to get started with a systematic review in epidemiology: an introductory guide for early career researchers

Study description

Aims and objectives of the study

Study setting (e.g. geographical location, time period)

Study design (e.g. cohort or case-control)

Recruitment procedures used

Inclusion and exclusion criteria

Length of follow-up

Participant description

Baseline characteristics

Follow-up characteristics

Target population and final number of subjects studied for outcome

Description of exposure (or intervention) and outcome measurements

Description of measurement of exposure and outcome (e.g. instrument, protocol, reliability)

Description of intervention, randomization and blinding (if applicable)

Statistical data/results

Statistical techniques used (e.g. regression, t-tests)

Confounding factors adjusted for

Results of study analysis (e.g. direction and magnitude of association, precision)

Conclusions of study