Early pregnancy loss incidence in high-income settings: a protocol for a systematic review and meta-analysis

Table 2 Search strategy summary for a systematic review of early pregnancy loss in high-income settings

Keywords
	Early pregnancy loss, spontaneous abortion, miscarriage, fetal loss, pregnancy loss, anembryonic pregnanc, embryonic loss, spontaneous miscarriage, early pregnancy failure, pregnancy failure, hydatidiform mole, septic abortion, missed abortion, incomplete abortion, ectopic pregnanc, risk, rate, prevalen, inciden, report, trend, impact*Keywords terms for high-income countries (as defined by World Bank; “High-Income OECD Countries”²⁵) (see Additional file 1: Search Strategy).
Database-specific subject headings
MEDLINE	Subject heading (MeSH): Spontaneous abortion, septic abortion, missed abortion, incomplete abortion, ectopic pregnancy, , hydatidiform mole, risk, morbidity, incidence, prevalence. MeSH terms for high-income countries (as defined by World Bank; “High Income OECD Countries”²⁵) (see Additional file 1: Search Strategy).
CINAHL	Subject heading: Spontaneous abortion, incomplete abortion, hydatidiform mole, ectopic pregnancy, incidence, prevalence, morbidity.
EMBASE	Subject heading (Emtree): Spontaneous abortion, septic abortion, incomplete abortion, missed abortion, blighted ovum, hydatidiform mole, risk, morbidity, incidence, prevalence. Emtree terms for high-income countries (as defined by World Bank; “High-Income OECD Countries”²⁵) (see Additional file 1: Search Strategy).

ISSN: 2046-4053