Study finds three-fold increase in pregnancy among young girls with mental illness

Young girls with mental illness are three times more likely to become teenage parents than those without a major mental illness, according to a first-of-its-kind study by researchers at the Institute for Clinical Evaluative Sciences (ICES) and Women's College Hospital.

The study, published today in the journal Pediatrics, is the first to examine trends in fertility rates among girls with mental illness.

"Research tells us that young girls are at high risk of pregnancy complications, including preterm birth, poor fetal growth and postpartum depression," said Dr. Simone Vigod, a psychiatrist at Women's College Hospital and an adjunct scientist at ICES. "Add to this a pre-existing mental illness, and these young women are forced to manage significant additional challenges."

In the study, researchers examined live birth rates from 1999 to 2009 in 4.5 million girls, 15 to 19 in Ontario, with and without a major illness. They found with a major mental health illness, including depression, bipolar disorder and other psychotic disorders, were three times more likely to become teenage parents.

Although birth rates in both affected and unaffected adolescent girls decreased over time, the gap between the groups appeared to be increasing slightly over the 10-year study period. Among girls with a major , live births decreased by only 14 per cent during the study period compared to a 22 per cent drop among unaffected girls.

"Although we do know some of the risk factors behind why with mental health illness may be at increased risk of becoming pregnant, pregnancy prevention programs in most developed countries have not traditionally considered " added Vigod.

The authors suggest targeted school-based programs are needed along with greater integration of reproductive health care into adolescent programs.

"Interventions that target and integrate reproductive and mental health care for young women are crucial to ensure we are providing the best care possible for adolescent mothers," said Cindy-Lee Dennis, senior scientist at Women's College Research Institute and a Canada Research Chair in Perinatal Community Health. "Having these programs and offerings in place will also help reduce teenage pregnancy and improve mother and child health outcomes."

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