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- W2413463712 abstract "A study is reported of 166 pregnancies that occurred during the years 1964-1969 despite the use of oral contraceptives containing estrogens. 90 of these pregnancies which occurred during 1968 are analyzed. 73 occurred with the use of a sequence preparation with a Pearl index of .467 and 17 occurred with the use of a combination preparation with a Pearl index of .005. The Pearl index for each brand of oral contraceptive sold in Sweden is presented. Most of the pregnancies occurred with women 31-35 years of age and with those having 1-4 previous pregnancies. 22 of the pregnancies during the use of sequence preparations occurred in the 2nd-3rd cycles and 9 of the pregnancies during the use of combination preparations occurred after the 5th cycle. 53 of the pregnancies occurring in the women using sequence preparations were attributed to tablet failure and 8 of the pregnancies in those using combination preparations were attributed to tablet failure. Of the total pregnancies occurring between 1964-1969 72 of the 128 pregnancies occurring with the use of sequence preparations and 15 of the 38 pregnancies occurring with the use of combination preparations were attributed to tablet failure. Combination preparations are considered to be the most secure contraceptive method." @default.
- W2413463712 created "2016-06-24" @default.
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- W2413463712 date "1970-06-15" @default.
- W2413463712 modified "2023-09-26" @default.
- W2413463712 title "[Peroral contraception (4): pregnancies]." @default.
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- W2413463712 hasPublicationYear "1970" @default.
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