The serum total cholesterol did not change significantly du ring 6 to 60 months of exposure to an oral contraceptive steroid combination (mestranol and norethynodrel). It has been indicated that the use of oral contraceptive steroids is associated with increases or no change in serum cholesterol/' 2, 3, 6, 8, 11, 13, 17 triglycerides,1,2 3, 6, 8, 11, 17 phospholipids,2' 3 beta lipoproteins,13 and low density and very low density lipoproteins. 1 , 2, 17 The studies cited vary in the particular steroids used, their dosages, and the duration of exposure to the contraceptives. Also, in some of the studies,s, 8, 17 pre-exposure observations were not available, and deductions concerning possible lipid effects of the oral contraceptive agent or agents were based on comparisons with untreated controls.The data herein presented are based on studies in women using only one pair of steroids, namely, mestranol and norethynodrel (Enovid) in one of three dosage combinations for contraception.Aided by grants from the Addison H. Gibson Foundation, the Western Pennsylvania Arthritis Foundation, and the Commonwealth of Pennsylvania.Received for publication Aug. 11, 1969. Accepted for publication Oct. 7, 1969.
188
Materials and methodsSerum total and alpha and beta lipoprotein cholesterol 9 , 12, 15 and total triglycerides 16 were measured at intervals of 6 months or less in 25 women (totalling 28 treatment periods ) in the fasting state prior to and during ingestion of mestranol and ethynodrel on Days 5 through 26 of the menstrual cyde. Enovid-E (mestranol 0.1 mg., norethynodrel 2.5 mg.), Enovid-5 (mestranol 0.075 mg., norethynodrel 5 mg.), and Enovid-10 (mestranol 1.15 mg., norethynodrel 10 mg.) were taken by 19, 8, and 1 of the women, respectively.Body weight was recorded at each visit. Our da ta are based on a minimum of 6 months of therapy or multiples thereof. When multiple measurements of serum lipids were performed in a patient prior to or within the initial or sueceeding 6 month period of observation, these were averaged and treated as one determination within that interval. The same procedure was followed with the body weight data. The statistical significance of any