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Table 2 Incidence studies

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

Study Characteristics

Johnston & Evans (2001) [19]

Arfvidsson (2001) [20]

Scurr (2001) [23]

Cesarone (2002) LONFLIT 3 [22]

Belcaro (2001) LONFLIT I [21]

Belcaro (2001) LONFLIT II [21]

Population

Healthy workers – pilots

Otherwise healthy- conference attendants

No history of VTE- apparently healthy individuals

High risk group

Both low and high risk

High risk subjects

Definition of VTE

NOT Stated (but it likely to be symptomatic)

DVT symptomatic

DVT asymptomatic

DVT asymptomatic

DVT asymptomatic

DVT asymptomatic

Method of diagnosis

Undefined

Diagnostic test

Diagnostic tests

Diagnostic test

Diagnostic test

Diagnostic test

Nature of exposure

Population of pilots

≥ 5 hours flight

≥ 8 hours flight

Not stated

Average 12.4 hours flight

Average 12.5 hours

Reported rate of VTE n/N

27/9775 (0.28%) during 10 years study

0/83 (0%)

12/116 (10.34%)

4/100 (4.00%)

11/778 (1.41%)

19/422 (4.50%)

Period of follow up

Person-year data is not stated. 10 years study, but little details given about the follow up.

4 weeks

Up to 6 weeks

Not stated Immediately post flight?

24 hours

24 hours