References
- Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation. Effects on the probability of conception, survival of the pregnancy, and sex of the baby. N Engl J Med 1995;333:1517-21
- Stanford JB, Dunson DB. Effects of sexual intercourse patterns in time to pregnancy studies. Am J Epidemiol 2007;165:1088-95
- Stanford JB, Smith KR, Dunson DB. Vulvar mucus observations and the probability of pregnancy. Obstet Gynecol 2003;101:1285-93
- Hilgers TW, Daly KD, Prebil AM, et al. Cumulative pregnancy rates in patients with apparently normal fertility and fertility-focused intercourse. J Reprod Med 1992;37:864-6
- Robinson JE, Ellis JE. Mistiming of intercourse as a primary cause of failure to conceive: results of a survey on use of a home-use fertility monitor. Curr Med Res Opin 2007;23:301-6
- Guida M, Tommaselli GA, Palomba S, et al. Efficacy of methods for determining ovulation in a natural family planning program. Fertil Steril 1999;72:900-4
- Vermesh M, Kletzky OA, Davajan V, et al. Monitoring techniques to predict and detect ovulation. Fertil Steril 1987;47:259-64
- Brezina PR, Haberl E, Wallach E. At home testing: optimizing management for the infertility physician. Fertil Steril 2011;95:1867-78
- World Health Organization. Temporal relationships between indices of the fertile period. Fertil Steril 1983;39:647-55
- Behre HM, Kuhlage J, Gassner C, et al. Prediction of ovulation by urinary hormone measurements with the home use ClearPlan Fertility Monitor: comparison with transvaginal ultrasound scans and serum hormone measurements. Hum Reprod 2000;15:2478-82
- Pearlstone AC, Surrey ES. The temporal relation between the urine LH surge and sonographic evidence of ovulation: determinants and clinical significance. Obstet Gynecol 1994;83:184-8
- Bourne TH, Hagstrom HG, Granberg S, et al. Ultrasound studies of vascular and morphological changes in the human uterus after a positive self-test for the urinary luteinizing hormone surge. Hum Reprod 1996;11:369-75
- Creinin MD, Keverline S, Meyn LA. How regular is regular? An analysis of menstrual cycle regularity. Contraception 2004;70:289-92
- Johnson SR, Miro F, Barrett S, et al. Levels of urinary human chorionic gonadotrophin (hCG) following conception and variability of menstrual cycle length in a cohort of women attempting to conceive. Curr Med Res Opin 2009;25:741-8
- Office for National Statistics: Statistics Bulletin. Births and deaths in England and Wales 2010. Available at: www.ons.gov.uk [Last accessed November 2011]
- Cole LA, Ladner DG, Byrn FW. The normal variabilities of the menstrual cycle. Fertil Steril 2009;91:522-7
- Baird DD, McConnaughey DR, Weinberg CR, et al. Application of a method for estimating day of ovulation using urinary estrogen and progesterone metabolites. Epidemiology 1995;6:547-50
- Bergsjo P, Denman DW, Hoffman HJ, et al. Duration of human singleton pregnancy. A population-based study. Acta Obstet Gynecol Scand 1990;69:197-207
- Gnoth C, Godehardt D, Godehardt E, et al. Time to pregnancy: results of the German prospective study and impact on the management of infertility. Hum Reprod 2003;18:1959-66
- Michael RT, Gagnon JH, Laumann EO, et al. Sex in America – a definitive survey. New York: Warner Books, 1995
- Tanabe K, Susumu N, Hand K, et al. Prediction of the potentially fertile period by urinary hormone measurements using a new home-use monitor: comparison with laboratory hormone analyses. Hum Reprod 2001;16:1619-24
- Spieler J, Collins W. Potential fertility – defining the window of opportunity. J Int Med Res 2001;29(Suppl 1):3A-13A
- Lynch CD, Jackson LW, Buck Louis GM. Estimation of the day-specific probabilities of conception: current state of the knowledge and the relevance for epidemiological research. Paediatr Perinat Epidemiol 2006;20(Suppl 1):3-12