Venous thrombosis in denmark is more frequent in winter

Publikation: Forskning - peer reviewTidsskriftartikel

We read with interest the recent letter in the Journal about seasonal variation of venous thrombosis by Ribeiro et al [1]. Based on three case-control or case-cohort studies they concluded that there is a small seasonal variation with a trough during spring but since the differences between the four seasons were within a few percent they deemed it without clinical relevance. This was in contrast to some earlier publications of which a recent meta-analysis [2] indicated a seasonal variation of venous thrombosis like the variation for arterial cardiovascular diseases showing a temporal pattern characterised by higher frequencies during winter compared with summer, but Ribeiro et al argued that this analysis might be biased because they had excluded one large study [3] showing no variation and because the meta-analysis was dominated by one large study showing a difference [4]. © 2012 International Society on Thrombosis and Haemostasis.
TidsskriftJournal of Thrombosis and Haemostasis
StatusE-pub ahead of print - 2012

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