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OBJECTIVE: To assess the risk of venous thrombosis in current users of different types of hormonal contraception, focusing on regimen, oestrogen dose, type of nike Roshe Run Women progestogen, and route of administration.DESIGN: National cohort study.SETTING: Denmark, 1995-2005.PARTICIPANTS: Danish women aged 15-49 with no history of cardiovascular or malignant disease.MAIN OUTCOME MEASURES: Adjusted rate ratios for all first time deep venous thrombosis, portal thrombosis, thrombosis of caval vein, thrombosis of renal vein, unspecified deep vein thrombosis, and pulmonary embolism during the study period.RESULTS: 10.4 million woman years were recorded, 3.3 million woman years in receipt of oral contraceptives. In total, 4213 venous thrombotic events were observed, 2045 in current users of oral contraceptives. The overall absolute risk of venous thrombosis per 10 000 woman years in non-users of oral contraceptives was 3.01 and in cheap Nike Roshe Australia current users was 6.29. Compared with non-users of combined oral contraceptives the rate ratio of venous thrombembolism in current users decreased with duration of use (<1 year 4.17, 95% confidence interval 3.73 to 4.66, 1-4 years 2.98, 2.73 to 3.26, and >4 years 2.76, 2.53 to 3.02; P<0.001) and with decreasing dose of oestrogen. Compared with oral contraceptives containing levonorgestrel and with the same dose of oestrogen and length of use, the rate ratio for oral contraceptives with norethisterone was 0.98 (0.71 to 1.37), with norgestimate 1.19 (0.96 to 1.47), with desogestrel 1.82 (1.49 to 2.22), with gestodene 1.86 (1.59 to 2.18), with drospirenone 1.64 (1.27 to 2.10), and with cyproterone 1.88 (1.47 to 2.42). Compared with non-users of oral contraceptives, the rate ratio for venous thromboembolism in users of progestogen only oral contraceptives with levonorgestrel or norethisterone was 0.59 (0.33 to 1.03) or with 75 mug desogestrel was 1.12 (0.36 to 3.49), and for hormone releasing intrauterine devices was 0.90 (0.64 to 1.26).CONCLUSION: The risk of venous thrombosis in current users of combined oral contraceptives decreases with duration of use and decreasing oestrogen dose. For the same dose of oestrogen and the same length of use, oral contraceptives with desogestrel, gestodene, or drospirenone were associated with a significantly higher nike Roshe Run Australia risk of venous thrombosis than oral contraceptives with levonorgestrel. Progestogen only pills and Nike Roshe Run hormone releasing intrauterine devices were not associated with any increased risk of venous thrombosis.Comment inOral contraceptives and venous thromboembolism. [BMJ. 2009]Oral contraceptives and venous thromboembolism.Dunn N. BMJ. 2009 Aug 13; 339:b3164. Epub 2009 Aug 13.The risk of deep venous thrombosis with oral contraceptives containing drospirenone. [BMJ. 2011]The risk of deep venous thrombosis with oral contraceptives containing drospirenone.Dunn N. BMJ. 2011 Apr 21; 342:d2519. Epub 2011 Apr 21.

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