Influence of the third generation pill controversy on prescriptions for oral contraceptives among first time users: population based study
- 1 February 2003
- Vol. 326 (7383) , 254
- https://doi.org/10.1136/bmj.326.7383.254
Abstract
We used pharmacy dispensing data from the InterAction database (a general prescription drugs database) in the northern Netherlands. In 2000, the database contained prescriptions from a population of approximately 37 000 women aged 15-44, and 224 prescribers (general practitioners and outpatient specialists). We selected all prescriptions for oral contraceptives from 1 January 1994 to 31 December 2000. First time users of oral contraceptives were defined as women who, according to the database, either were prescribed any oral contraceptive for the first time or who had not been prescribed an oral contraceptive for at least one year. Hence, 1994 was used as a washout period. We calculated for first time users of oral contraceptives the proportion of women per year receiving a third generation oral contraceptive (1995 to 2000). To study a change in the proportion, we used SPSS version 10 to calculate χ2 tests for linear trend after stratification by age (<20, 20-24, 25-29, 30-34, 35-39, and ≥40 years).Keywords
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