Creighton Model Effectiveness, Intentions and Behaviors Assessment (CEIBA)

There are a variety of natural family planning (NFP) methods available today that differ in algorithm and biomarkers used to identify women's fertile window. This study will directly evaluate the NFP system known as the Creighton Model FertilityCare System (CrM). The Creighton Model System is a well-established educational system about fertility which involves no devices. The CrM teaches women a standardized way of observing and describing their vaginal discharge each day during routine use of the bathroom, and interpreting the changes in vaginal discharge to determine whether they are likely to be fertile that day or not. Vaginal discharge changes as tracked by the CrM are an accurate indicator of the changes in secretions from the uterine cervix that relate to the approach of ovulation.

This study will also examine the relationship between a couple's stated intentions to achieve or avoid a pregnancy during each menstrual cycle with their sexual behavior during the same cycle. There is growing consensus among researchers that current measures of pregnancy intention are simplistic at best, and at worst can be very misleading. One of the purposes of the study is to explore the multiple dimensions of pregnancy motivations, intentions, and behaviors by newer detailed measures.

This study will enroll couples who are new or returning CrM users and who are trying to avoid a pregnancy at the time they begin use of the CrM. The participants will be recruited from CrM FertilityCare Centers. The design is a prospective cohort study, which is the optimal study design to assess different measures of effectiveness and intendedness simultaneously in a group of NFP users. Several of the key measures of intention and behavior required for this study must be assessed prior to the outcome of actual use of CrM over time and the outcome of pregnancy, to avoid recall bias. Outcomes for this study require relatively precise assessment of the timing of both intentions and behaviors, which is simply unavailable from recall. We plan to enroll at least 300 and up to 400 couples in the study. This represents 60% (300/497) of the estimated available and eligible couples learning the CrM for use to avoid pregnancy in one year at the participating FertilityCare Centers.

Inclusion criteria

• Being a new or return user of the Creighton Model with the stated intention of avoiding pregnancy
• Sexually active or planning to be sexually active within 6 months of the enrollment date (relevant to some engaged couples who learn CrM)
• The woman is between the ages of 18 to 40
• The man is age 18 or older
• The woman has had at least 2 menstrual flows in the past 3 months or at least one menstrual flow since stopping hormonal birth control
• The woman is able to complete questionnaires in English

Exclusion criteria

• History of infertility
• Confirmed pelvic inflammatory disease, surgically confirmed untreated endometriosis, chemotherapy (either man or woman), or radiation to the reproductive tract (either man or woman)
• Hysterectomy, oophorectomy (ovary removed), tubal ligation, fallopian tube surgery, surgery for ectopic pregnancy, removal of a testicle (orchiectomy) or vasectomy
• Depo-Provera injection any time in the past 2 years
• Totally breastfeeding an infant, without any supplements