Department of Gynaecological Endocrinology and Fertility Disorders, University of Heidelberg, Vossstrasse 9, 69115 Heidelberg, Germany. petra.frank-herrmann@med.uni-heidelberg.deROR
The likelihood of spontaneous conception in subsequent cycles is important for a balanced management of infertility. Previous studies on time to pregnancy are mostly retrospective and biased because of exclusion of truly infertile couples. The study aim was to present a non-parametric estimation of cumulative probabilities of conception (CPC) in natural family planning (NFP) users illustrating an ideal of human fertility potential.
Methods
A total of 346 women was observed who used NFP methods to conceive from their first cycle onwards. The couples practising NFP make optimal use of their fertility potential by timed intercourse. The CPC were estimated for the total group and for couples who finally conceived by calculating Kaplan-Meier survival rates.
Results
A total of 310 pregnancies occurred among the 346 women; the remaining 36 women (10.4%) did not conceive. Estimated CPC for the total group (n = 340 women) at one, three, six and 12 cycle(s) were 38, 68, 81 and 92% respectively. For those who finally conceived (truly fertile couples, n = 304 women), the respective pregnancy rates were 42, 75, 88 and 98% respectively. Although the numbers of couples in both groups were similar, the impact of age on time to conception, as judged by the Wilcoxon test, was less in the truly fertile than in the total group.
Conclusions
Most couples conceive within six cycles with timed intercourse. Thereafter, every second couple is probably either subfertile or infertile. CPC decline with age because heterogeneity in fecundity increases. In the subgroup of truly fertile couples, an age-dependent decline in CPC is statistically less obvious because of high homogeneity, even with advancing age.
time to pregnancy natural family planning prospective study, cumulative probability conception timed intercourse NFP, Gnoth Freundl time to pregnancy German study, subfertility infertility definition time to conception cycles, natural family planning fertility awareness conception rates, Kaplan-Meier survival analysis time to pregnancy, age effect fecundity time to conception, spontaneous conception probability infertility management, timed intercourse fertile window conception rate, human fertility potential natural conception six cycles, fecundability decline age heterogeneity conception
PMID 12923157 12923157 DOI 10.1093/humrep/deg366 10.1093/humrep/deg366 Gnoth et al. 2003, Gnoth 2003
Cite this article
Gnoth, C., Godehardt, D., Godehardt, E., Frank-Herrmann, P., & Freundl, G. (2003). Time to pregnancy: results of the German prospective study and impact on the management of infertility. Human reproduction (Oxford, England), 18(9), 1959-1966. https://doi.org/10.1093/humrep/deg366
Gnoth C, Godehardt D, Godehardt E, Frank-Herrmann P, Freundl G. Time to pregnancy: results of the German prospective study and impact on the management of infertility. Hum Reprod. 2003;18(9):1959-1966. doi:10.1093/humrep/deg366
Gnoth, C., et al. "Time to pregnancy: results of the German prospective study and impact on the management of infertility." Human reproduction (Oxford, England), vol. 18, no. 9, 2003, pp. 1959-1966.
Recent studies on fertility awareness among the reproductive population have reported the lack of accurate knowledge about fertility and assisted reproductive technologies. However, there has been little information regarding women trying to get pregnant at home. The aim of this study was to explore the prevalence of subclinical infertility among women trying to get pregnant at home, and to evaluate awareness regarding infertility and reasons for not visiting infertility clinics among women who use pregnancy-assist mobile applications to help them conceive. A total of 2084 Japanese women responded to this online survey. We selected 1541 women according to the study criteria. Based on the results of 61 questions, we evaluated knowledge regarding fertility, prevalence of subclinical infertility, and reasons for not visiting the clinic among the participants. Despite the desire to conceive, the participants had an apparent tendency to overestimate the age limit for childbearing. A total of 338 (21.9%) women answered that in general women aged > 45 years could get pregnant. Approximately 40% of the women had possible subclinical infertility and were unaware of the fact. Additionally, about 70% of the women considered themselves to have infertility problems. Women who were aware of the possibility of infertility hesitated to visit the clinic due to unfamiliarity with a gynecologist or clinic, and apprehensions about the gynecologic examination. In our study, some women required treatment for infertility. Nonetheless, they hesitated to visit an infertility clinic. Sexual health education, together with proper accessibility to gynecology clinics, are necessary to reduce involuntary childlessness.
Vander Borght M et al., 2018·Clinical Biochemistry
Infertility is a disease characterized by the failure to establish a clinical pregnancy after 12 months of regular and unprotected sexual intercourse. It is estimated to affect between 8 and 12% of reproductive-aged couples worldwide. Males are found to be solely responsible for 20-30% of infertility cases but contribute to 50% of cases overall. Secondary infertility is the most common form of female infertility around the globe, often due to reproductive tract infections. The three major factors influencing the spontaneous probability of conception are the time of unwanted non-conception, the age of the female partner and the disease-related infertility. The chance of becoming spontaneously pregnant declines with the duration before conception. The fertility decline in female already starts around 25-30 years of age and the median age at last birth is 40-41 years in most studied populations experiencing natural fertility. The disease-related infertility may affect both genders or be specific to one gender. The factors affecting both genders' fertility are hypogonadotrophic hypogonadism, hyperprolactinemia, disorders of ciliary function, cystic fibrosis, infections, systemic diseases and lifestyle related factors/diseases. Premature ovarian insufficiency, polycystic ovary syndrome, endometriosis, uterine fibroids and endometrial polyps may play a role in female infertility. Male infertility may be due to testicular and post-testicular deficiencies. Semen decline that has been observed over the years, endocrine disrupting chemicals and consanguinity are other factors that may be involved.
Flores R, 2016·Scholars Academic Journal of Biosciences·
The latest retrievable data about infertility in the Philippines was made available to the public by Merck Serono, a private pharmaceutical company who commissioned the survey in 2011. The survey was conducted by Synovate in 100 participating households in the Philippines, particularly in key cities located in Luzon, Visayas and Mindanao. The survey results revealed that one out of ten Filipino couples are suffering from infertility. And these couples are not seeking treatment due to the following reasons: (1) financial constraints; (2) time constraints; and (3) the patient’s belief. Of all these, financial constraints, at 86%, is the primary reason why infertile couples are not seeking treatment. In addition to this data, the Chief of The Medical City’s Reproductive Medicine, Infertility and Gynecologic Endoscopy, Dr. Marc Anthony Ancheta, further reveals that “some 35 to 40% of a couple’s inablity to conceive a child are due to female factors; while the other 35 to 40% could be attributed to male factors.” While male factor infertility is also deserving of proper attention, it is the female factor infertility that should receive greater attention and focus in terms of treatment. Why? Because, primarily, the female’s reproductive cycle is very complex and would need months and/or years to partially identify the underlying reason/s of infertility; and second, the female’s ability to conceive naturally will fall by 50% when she reached the age of 35. Therefore, there should be urgency in treating female factor infertility in an efficient, ethical and affordable way. And these conditions can be achieved by the use of NaPro Technology.
This report presents nationally representative estimates and trends for infertility and impaired fecundity-two measures of fertility problems-among women aged 15-44 in the United States. Data are also presented on a measure of infertility among men aged 15-44. Data for this report come primarily from the 2006-2010 National Survey of Family Growth (NSFG), which consisted of 22,682 interviews with men and women aged 15-44, conducted from June 2006 through June 2010. The response rate for women in the 2006-2010 NSFG was 78%, and for men was 75%. Selected trends are shown based on prior NSFG years. The percentage of married women aged 15-44 who were infertile fell from 8.5% in 1982 (2.4 million women) to 6.0% (1.5 million) in 2006-2010. Impaired fecundity among married women aged 15-44 increased from 11% in 1982 to 15% in 2002, but decreased to 12% in 2006-2010. Among all women, 11% had impaired fecundity in 2006-2010. Both infertility and impaired fecundity remain closely associated with age for nulliparous women. Among married, nulliparous women aged 35-44, the percentage infertile declined from 44% in 1982 to 27% in 2006-2010, reflecting greater delays in childbearing over this period. Among married women in 2006-2010, non-Hispanic black women were more likely to be infertile than non-Hispanic white women. Some form of infertility (either subfertility or nonsurgical sterility) was reported by 9.4% of men aged 15-44 and 12% of men aged 25-44 in 2006-2010, similar to levels seen in 2002.