Knowledge of age-related fertility decline in women: A systematic review.

Age-related fertility decline (ARFD) knowledge has been evaluated in the past decade, showing that there is a general knowledge of the reduction of fertility with age. Here we review the studies published up to date which quantitatively measure this ARFD knowledge, to answer the question: how aware about ARFD is our society? We searched the terms "age", "fertility knowledge", "fertility awareness", "reproduction knowledge", "reproductive knowledge" and "reproductive health knowledge" in PubMed, Web of Science, PsychINFO and Scopus, within January 2000 and December 2016. We found 41 studies that quantitatively measured ARFD knowledge by asking for the most fertile age for a woman and/or when there are a slight and a marked decrease in female fertility. We obtained this searching for the questions: What is the most fertile age for a woman? (Q1). When there is a slight decrease in female fertility? (Q2) and, When there is a marked decrease in female fertility? (Q3). We further evaluated the knowledge increase in the 6 studies assessing an educational intervention, 4 of them randomized controlled trials (RCT). Participants reporting the most fertile age for women to be at 20-24 y.o. ranged 16%-89.4% (Q1); participants reporting a slight decrease in female fertility at 25-29 y.o. ranged 5.1%-83% (Q2), and those reporting that a marked decrease occurs between 35-39 y.o. ranged 5.6%-60% (Q3). On the whole, the studies included in this review conclude that ARFD knowledge is insufficient, particularly in determining when female fertility markedly decreases. ARFD knowledge can be increased through targeted campaigns, but few interventional studies have been performed up to date. In view of these results, ARFD campaigns targeted to reproductive age people and healthcare providers are necessary; this would help the society to make informed reproductive decisions throughout life.