The American Journal of Orthopsychiatry is published by the APA (American Psychological Association). In the January 2002 issue, which is Volume 72, No. 1, they published the research article, "State-funded abortions vs. deliveries: A comparison of outpatient mental health claims over five years."
This is a record-based study of 173,000 California women. A record-based study means that only public health records were examined in order to perform the research. These kinds of study are desirable because they do not rely on subjective self-reports.
The study reveals that women were 63 percent more likely to receive mental care within 90 days of an abortion compared to those women who carried their pregnancies to term. In addition, significantly higher
rates of subsequent mental health treatment persisted over the entire four years of data examined. The study controlled for pre-pregnancy levels of mental health treatment.
The January 2002 edition of The American Journal of Orthopsychiatry is not currently archived online. Consequently, the link I provide in my "research studies" list on the left takes you to a write-up of the study by one of its principal authors, David Reardon of The Elliot Institute.