We identified 9,009,202 unique individuals of known parentage, where both parents were alive and living in Sweden after 1973. There were 35,985 individuals who met the criteria for schizophrenia and 40,487 individuals for bipolar disorder. Of those with schizophrenia, 2,543 also had bipolar disorder (RR=16.4 95% CI=15.1–17.7).
