Flurazepam

Study	Country Study period	Population source	Exposure definition	Non-exposure definition	Sample size	Rmk
Noh, 2022	South Korea 2011 - 2018	All pregnancies in women aged 20 to 45 years at delivery resulting in live births from 1 January 2011 to 31 December 2018, in South Korea.	Pregnant women who filled at least Flurazepam prescription during the first trimester (first 90 days of pregnancy).	unexposed, sick Pregnant women who were not prescribed any benzodiazepine from 3 months before the last menstrual period to the end of the first trimester (with similar psychiatric conditions after propensity score).	159 / 3053381	Propensity scored adjusted for indications and led to an unexposed cohort with similar psychiatric conditions => considered as unexposed, sick control groups.

Study	Country Study period	Case	Control	Sample size	Rmk
Kitchin, 2022	Spain 2002 - 2015	Pregnant woman suffering a miscarriage.	Pregnant woman randomly selected from the whole cohort among women who were still at risk within follow-up, by risk-set sampling and individually matched to cases.	18070 / 54209	Authors provided 2 exposure definitions: Use in both periods (continuers) and Use only during pregnancy (new users) => use of data for 'Use in both periods (continuers)', to decrease misclassification bais (exposure occurred before outcome).
Sheehy, 2019	Canada 1998 - 2015	Pregnancies ending with spontaneous abortion (pregnancy loss between between the beginning of the sixth week of gestation and the 19th completed week of gestation, excluding planned or induced abortions).	Pregnancies ending with live births (5 for each case) randomly selected at the index date and matched with the case pregnancy by gestational age and calendar year.	27149 / 134305