The purpose of the study is to determine safety and efficacy of long-cycle regimens of an oral contraceptive.
The study has previously been posted by Schering AG, Germany. Schering AG, Germany has been renamed to Bayer Schering Pharma AG (BSP AG), Germany. Bayer Schering Pharma AG, Germany is the sponsor of the trial. The previously posted secondary Outcome Measure "Parameters of safety and tolerability" has been removed from result posting as it is covered by the Adverse Event section.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
1,166
3 cycles of treatment, each cycle comprising 120 days intended treatment with one tablet daily of 20µg ethinyl estradiol as betadex clathrate (EE20) plus 3 mg drospirenone (DRSP) followed by a 4 day tablet-free interval. If 3 consecutive days of bleeding and/or spotting occurred during the 120 day treatment period, a 4 day tablet free interval was advised. The minimum period between 2 tablet free intervals was 24 days. After each 4 day tablet free interval, a new 120 day intended treatment period was to be restarted, resulting in a minimum of 3 and maximum of 13 withdrawal bleeding episodes during one year of treatment.
3 cycles of treatment, each cycle comprising 120 days uninterrupted treatment with one tablet daily of 20µg ethinyl estradiol as betadex clathrate plus 3 mg drospirenone followed by a 4 day tablet free interval, 3 withdrawal bleeding episodes during one year of treatment were expected.
Unnamed facility
Drummondville, Quebec, Canada
Number of Days With Bleeding Including Spotting
The number of bleeding days per volunteer was calculated by summing up all days with bleeding intensity spotting or worse. The primary evaluation was the comparison of the flexible extended vs the standard regimen for this primary target variable, which was done for data within the first year of treatment only. As no further comparison or testing was done, no multiplicity issue arose.
Time frame: up to 1 year
Number of Unintended Pregnancies in Yaz Flexible Arm
Pregnancies with conception date within 4 days after end of study medication were regarded as during treatment.
Time frame: up to 2 years
Pearl Index
The Pearl Index (PI) is defined as the number of pregnancies per 100 woman years. The 2-year PI was obtained by dividing the number of pregnancies that occurred during the two years of treatment by the time (in 100 women years) that the women were under risk of getting pregnant. 95% confidence interval according to European Medicine Agency Note for guidance on clinical investigation of steroid contraceptives in women.
Time frame: Up to 2 years
Number of Unintended Pregnancies Due to Method Failure
Not included in this analysis are pregnancies due to subject failure eg. non-compliance with tablet intake rules.
Time frame: Up to 2 years
Adjusted Pearl Index
The adjusted Pearl Index was based on pregnancies due to method failures and compliant treatment cycles, i.e. cycle length between 24 and 124 day, pill break not longer than 7 days, and number of pills taken not smaller than 90% of the number of days in that cycle minus 7 days.
Time frame: Up to 2 years
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13 cycles of treatment, each cycle comprising an intake of one tablet daily with 24 days of active tablets (20µg ethinyl estradiol as betadex clathrate plus 3 mg drospirenone) followed by 4 days of placebo tablets, 13 withdrawal bleeding episodes during one year of treatment were expected.
Unnamed facility
Montreal, Quebec, Canada
Unnamed facility
Pointe-Claire, Quebec, Canada
Unnamed facility
Québec, Quebec, Canada
Unnamed facility
Shawinigan, Quebec, Canada
Unnamed facility
Ste-Foy, Quebec, Canada
Unnamed facility
Ettlingen, Baden-Wurttemberg, Germany
Unnamed facility
Karlsruhe, Baden-Wurttemberg, Germany
Unnamed facility
Ansbach, Bavaria, Germany
Unnamed facility
Krumbach, Bavaria, Germany
...and 25 more locations
Number of Days With Bleeding Excluding Spotting
The number of bleeding days per volunteer was calculated by summing up all days with bleeding intensity light, normal, or heavy.
Time frame: up to 1 year
Number of Bleeding Days During One Year of Treatment in Subjects With at Least 248 Days of Exposure Normalized to 372 Days
For early dropouts and pregnant subjects with an exposure period of less than 1 year but at least 248 days, the number of bleeding/spotting days was normalized to correspond to a 1-year exposure period.
Time frame: up to 1 year
Number of Bleeding / Spotting Days by 90-day Reference Period
The mean number of bleeding / spotting days, spotting-only and bleeding days was analyzed using reference periods of 90 days as recommended by the WHO.
Time frame: up to 1 year
Number of Bleeding / Spotting Episodes in 90 Day Reference Period
The mean number of bleeding / spotting episodes was analyzed using reference periods of 90 days as recommended by the WHO.
Time frame: Up to one year
Days With Scheduled Versus Unscheduled Bleeding
Days with scheduled and unscheduled bleeding were evaluated for extended regimens only. Unscheduled is any bleeding/spotting that occurred while taking active hormones regardless of the duration of intake, unless they occurred after tablet-free interval during days 1-4 of subsequent treatment cycle, or unless they occurred during days 1-7 of first treatment cycle. Scheduled is any bleeding/spotting that occurred during tablet-free interval, regardless of duration of tablet intake, or during next 4 days of subsequent treatment cycle.
Time frame: Up to one year