胎盘早剥的发生率约为 0.3%-1%。[3]Ananth CV, Keyes KM, Hamilton A, et al. An international contrast of rates of placental abruption: an age-period-cohort analysis. PLoS One. 2015;10:e0125246.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4446321/http://www.ncbi.nlm.nih.gov/pubmed/26018653?tool=bestpractice.com[4]Tikkanen M. Placental abruption: epidemiology, risk factors and consequences. Acta Obstet Gynecol Scand. 2011;90:140-149.http://www.ncbi.nlm.nih.gov/pubmed/21241259?tool=bestpractice.com这些发病率大部分基于病历记录的流行病学研究以及出生证明数据。但是,发病率随着诊断标准的改变而变化。当病理学家常规检查胎盘时,早剥的发病率将更高。[5]Bernischke K. Placental pathology and asphyxia. In: Gluck L, ed. Intrauterine asphyxia and the developing fetal brain. Chicago, IL: Yearbook Medical Publishers; 1977.[6]Ventolini G, Samlowski R, Hood DL. Placental findings in low-risk, singleton, term pregnancies after uncomplicated deliveries. Am J Perinatol. 2004;21:325-328.http://www.ncbi.nlm.nih.gov/pubmed/15311368?tool=bestpractice.com此外,负责接生的医师可能很难发现轻微的早剥。近年来,早剥的发生率轻度上升。虽然这可能是由于诊断的准确度提高。[7]Ananth CV, Oyelese Y, Yeo L, et al. Placental abruption in the United States, 1979 through 2001: temporal trends and potential determinants. Am J Obstet Gynecol. 2005;192:191-198.http://www.ncbi.nlm.nih.gov/pubmed/15672024?tool=bestpractice.com黑人女性发病率的升高高于白人女性。[7]Ananth CV, Oyelese Y, Yeo L, et al. Placental abruption in the United States, 1979 through 2001: temporal trends and potential determinants. Am J Obstet Gynecol. 2005;192:191-198.http://www.ncbi.nlm.nih.gov/pubmed/15672024?tool=bestpractice.com