Association between first-trimester vaginal bleeding and miscarriage.

Hasan R, Baird DD, Herring AH, Olshan AF, Jonsson Funk ML, Hartmann KE. Association between first-trimester vaginal bleeding and miscarriage. Obstetrics and gynecology. 2009 Oct;114(114). 860-867. PMID: 19888046 [PubMed] PMCID: PMC2828396 NIHMSID: NIHMS139879.

To estimate the strength of association between first-trimester bleeding and miscarriage, setting aside bleeding at time of loss.