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Figure E.1: Study Design Algorithm

Comparison between exposed & unexposed work sites?

No

Non-Comparative Study e.g., Case series Focus Group Case study Descriptive epi. study

Yes

Cross Sectional

Yes

Exposure (i.e. OHSMS intervention) and outcome determined in the same population (population of work sites) at the same time?

No

No

No

Three + measurements made before, during or after an intervention?

Yes

Before- After

Time Series

No

More than one group of work sites studied?

Yes

Investigators assign exposure?

Yes

Exposure assigned at group level? (e.g., community, county)

Yes

Exposure assigned randomly?

Yes

Case

Outcome

Groups defined

Control

by?

No

No

Non-randomized “trial”

Exposure

Other designs with concurrent comparison groups (e.g., time series study with comparison group)

No

Cohort Design? (i.e. cohort of work sites)

Yes

Perspective?

Yes

No

Retrospective Cohort Study

Institute for Work & Health

Randomized trial

Group randomized trial

Prospective Cohort Study

122

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