"Confounding Factors"

Population-based study of risk of venous thromboembolism associated with various oral contraceptives.
BACKGROUND: Four studies published since December, 1995, reported that the incidence of venous thromboembolism (VTE) was higher in …
R. D. Farmer, R. A. Lawrenson, C. R. Thompson, J. G. Kennedy, I. R. Hambleton
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Oral contraceptive switching patterns in the United Kingdom: an important potential confounding variable in studies of venous thromboembolism.
OBJECTIVE: To investigate whether patients changing from their current oral contraceptive (OC) are preferentially switched to …
R. D. Farmer, R. A. Lawrenson, I. R. Hambleton
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