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CycleBeads is a visual tool that was developed by the Institute for Reproductive Health at Georgetown University. This device helps women use the Standard Days Method, a fertility awareness-based family planning method. The Standard Days Method is based on the fact that there is a fertile window during a woman's menstrual cycle which begins several days before ovulation and ends a few hours after ovulation. During this time a woman can become pregnant. The Standard Days Method identifies days 8-19 of cycle for women with cycles between 26 and 32 days long, as the potential fertile window. This formula is based on computer analysis of 7,500 menstrual cycles and takes into account cycle length, the timing of ovulation, the variation of the timing of ovulation from one cycle to the next, as well as the lifespan of the sperm and ovum.〔M. Arevalo et al. "A fixed formula to define the fertile window of the menstrual cycle as the basis of a simple method of Natural Family Planning," Contraception 60 (1999);357-60.〕 To prevent pregnancy using the Standard Days Method and CycleBeads, users avoid unprotected sex by using a condom or abstaining during days 8-19 of the cycle. ==How to Use== CycleBeads, a color-coded string of beads that represents the days of a woman's cycle, helps an individual use the Standard Days Method, by helping her track her cycle days. Starting the first day of her period, she moves a band to the red bead then to a new bead every day. The color of the bead lets her know if today is a day she is highly likely to be fertile or not. On blue bead days, she has a very high risk of pregnancy. On white bead days, she has a very low risk of pregnancy. Couples use condoms or barrier methods to prevent pregnancy on blue bead days. An efficacy trial found that CycleBeads was more than 95% effective at preventing pregnancy with correct use and approximately 88% effective with typical use among women who reported recent cycles of 26–32 days.〔M. Arevalo et al. "Efficacy of a new method of family planning: the Standard Days Method," Contraception 65 (2002) 333-338.〕 This is similar or better than the efficacy of most other user dependent methods.〔R. Hatcher, ed. et al. Contraceptive Technology, 18th edition, 2004.〕 Women can use CycleBeads to plan pregnancy as well. On blue bead days, she is at her most fertile. Couples target those days for intercourse to conceive a child. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「CycleBeads」の詳細全文を読む スポンサード リンク
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