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Table 1 Inclusion criteria

From: The association between air travel and deep vein thrombosis: Systematic review & meta-analysis

Incidence of DVT during air flight
Design Any design other than case report
Population Any individuals who have travelled by air regardless of sex, age or risk status
Exposure Air travel (short or prolonged flight)
Comparator Not required
Outcomes Asymptomatic or symptomatic VTE confirmed by clinical or diagnostic methods, or related mortality
Air flight as a risk factor for DVT
Design Any comparative study design i.e. randomised controlled trial, prospective or retrospective cohort study or case control study.
Population Any individuals who have travelled by air regardless of sex, age or risk status.
Exposure Air travel (short or prolonged flight)
Comparator No air travel
Outcomes Asymptomatic or symptomatic VTE confirmed by clinical or diagnostic methods, pulmonary embolus (PE) or related mortality up to month after exposure