Table 2. Demographic distribution of the excluded studies.

	Study Title	Design	Year of the Study	Study Setting	Sample Size	Main outcomes Studied
1	Aspirin as a Prophylaxis in Pre-Eclampsia and Its Complications in Medina, Saudi Arabia [21].	Cross-sectional survey	2019	Al Madinah region, Saudi Arabia	700	Safety and efficacy of low-dose aspirin in preventing pre-eclampsia and its complications
2	Prevention of Pre-eclampsia in Saudi Arabia Knowledge about Risk Factors and Aspirin Use among Obstetrical Care Physicians - A National Survey [2].	Cross-sectional survey	2024	Saudi Arabia	160	Knowledge gap among obstetrical care providers about aspirin prophylaxis
3	Awareness of Pre-eclampsia and Measurement of Risk Factors in Women from the Western Region of Saudi Arabia: A Cross-sectional Study [24].	Cross-sectional survey	2022	Western Region of Saudi Arabia	541	Awareness and measurement of risk factors of pre-eclampsia
4	Level of knowledge on pre-eclampsia symptoms, complications, and risk factors among women in Saudi Arabia: A cross-sectional study [25].	Cross-sectional survey	2022	Makkah, Saudi Arabia	378	Knowledge of pre-eclampsia symptoms, complications, and risk factors
5	Awareness and Knowledge of Pre-eclampsia Among Saudi Women of Reproductive Age [26].	Cross-sectional survey	2023	Saudi Arabia	1169	Knowledge about pre-eclampsia
6	Seronegative Obstetric Antiphospholipid Syndrome Finally Treated Successfully [27].	Case report	2022	King Fahad Military Medical Complex, Dhahran, Saudi Arabia	1	Case of obstetric antiphospholipid syndrome
7	Aspirin Use among Saudi Adults: The Prevalence and Users' Characteristics [28].	Cross-sectional survey	2021	Saudi Arabia	771	Prevalence of aspirin use and characteristics of users