Opposites might not attract—at least when it comes to mental health.

A new large-scale global study revealed that across cultures, people were more likely to marry a partner who shares the same psychiatric diagnosis.

Published in Nature Human Behavior, the new research examined data from almost 15 million people in Denmark, Sweden, and Taiwan, relying on massive data sets collected in government registries.

The trend didn’t just prove true for a single diagnosis. The study examined married pairs across nine psychiatric disorders: bipolar disorder, depression, schizophrenia, anxiety, attention-deficit hyperactivity disorder (ADHD), autism, obsessive compulsive disorder (OCD), anorexia, and substance-use disorder.

The study found that across diagnoses, if one spouse in a married couple h

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