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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