Since the publication of our article, we have learned that the paper by Trabert et al, which we cited extensively, had been subject to an error and published correction. In our article, we included the original (uncorrected) results from that article in contextualizing our findings.

Trabert et al reported rates of ectopic pregnancy among women in Group Health Cooperative, an insured population in Washington and Idaho with few (estimated 5%) Medicaid beneficiaries. In their original article, they reported ectopic pregnancy rates that ranged from 1.78% of all pregnancies from 1993-1995 to 2.45% from 2005-2007. They later corrected these rates to 1.71% (1993-1995) and 1.36% (2005-2007). In the time period corresponding to our study (2000-2003), Trabert et al originally reported rates of 1.94% (1999-2001) and 2.00% (2002-2004) in Group Health Cooperative. They later corrected these to 1.47% and 1.39%, respectively.

Their correction to report lower ectopic pregnancy rates among the Group Health Cooperative population further emphasizes that the ectopic pregnancy rates that we found among Medicaid beneficiaries in New York (2.38%), California (2.07%), and Illinois (2.43%) are high compared with rates described in other populations.