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Arch Fam Med. 1999 Sep-Oct;8(5):391-402.

Pregnancy probabilities during use of the Creighton Model Fertility Care System.

Author information

1
Fertility Care Services, Covenant Health System, Lubbock, Tex., USA.

Abstract

OBJECTIVE:

To evaluate pregnancy probabilities during use of the Creighton Model Fertility Care System (CrMS).

DESIGN:

Couples who began use of the CrMS were entered into this observational cohort study. Follow-up included detailed reviews of use of the CrMS. Pregnancy probabilities were calculated with both net and gross life-table analysis through 18 months.

SETTING:

A natural family planning service delivery program based at an urban hospital in Houston, Tex.

SUBJECTS:

A group of 701 couples who received instruction in the CrMS were entered into the study. Most couples (93%) were engaged or married. Most women were white (83%), between the ages of 20 and 34 years (88%), and college graduates (58%).

MAIN OUTCOME MEASURE:

Pregnancies were classified based on a detailed evaluation involving the pregnant woman (usually with her partner).

RESULTS:

At 12 months, the following net pregnancy probabilities were found per 100 couples: method-related pregnancies, 0.14; pregnancies caused by user and/or teacher error, 2.72; pregnancies caused by achieving-related behavior (genital contact during a time known to be fertile), 12.84; unresolved pregnancies, 1.43; and total pregnancies, 17.12. Pregnancy probabilities were similar when stratified by the following reproductive categories: uncomplicated regular cycles, long cycles, discontinuing oral contraceptives, breastfeeding, and other.

CONCLUSIONS:

Pregnancy probabilities of the CrMS compare favorably with those of other methods of family planning. Most pregnancies result from genital contact during a known fertile time. Women need not have regular cycles to use the CrMS successfully.

PMID:
10500511
[Indexed for MEDLINE]

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