Pregnancies resulting in miscarriage between 2004 and 2018 were included in the case group and matched in a 1:1 ratio with control individuals. The study, published in the journal JAMA Psychiatry, included 3,067,122 (over 30 lakh) pregnancies among 1,957,601 (over 19 lakh) women. It was found that 4.4 per cent of these pregnancies resulted in miscarriage.