Behre HM, Kuhlage J, Gassner C, Sonntag B, Schem C, Schneider HP, Nieschlag E 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 Dec;15(12):2478-82. doi: 10.1093/humrep/15.12.2478.
Gibbons T, Reavey J, Georgiou EX, Becker CM Timed intercourse for couples trying to conceive. Cochrane Database Syst Rev. 2023 Sep 15;9(9):CD011345. doi: 10.1002/14651858.CD011345.pub3.
Martins MV, Fernandes J, Pedro J, Barros A, Xavier P, Schmidt L, Costa ME Effects of trying to conceive using an every-other-day strategy versus fertile window monitoring on stress: a 12-month randomized controlled trial. Hum Reprod. 2022 Nov 24;37(12):2845-2855. doi: 10.1093/humrep/deac228.
Song SH, Kim DS, Yoon TK, Hong JY, Shim SH Sexual function and stress level of male partners of infertile couples during the fertile period. BJU Int. 2016 Jan;117(1):173-6. doi: 10.1111/bju.13201. Epub 2015 Jul 14.
Tiplady S, Jones G, Campbell M, Johnson S, Ledger W Home ovulation tests and stress in women trying to conceive: a randomized controlled trial. Hum Reprod. 2013 Jan;28(1):138-51. doi: 10.1093/humrep/des372. Epub 2012 Oct 18.
Weddell S, Jones GL, Duffy S, Hogg C, Johnson S, Ledger W Home ovulation test use and stress during subfertility evaluation: Subarm of a randomized controlled trial. Womens Health (Lond). 2019 Jan-Dec;15:1745506519838363. doi: 10.1177/1745506519838363.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
