Also Read | Why Kerala may not swing this time roundThe review included studies that investigated the impact of the pandemic on maternal death rates from middle-income countries -- one from India and the other from Mexico.“Pooled analysis of data from both studies found that the risk of mothers dying during pregnancy or childbirth was increased by more than a third compared with before the pandemic (maternal death rate: during pandemic, 530/1,237,018 pregnancies vs pre-pandemic: 698/2,224,859 pregnancies)," the study said.Researchers reviewed data from 40 studies that were published between 1 January 2020 and 8 January 2021, representing 17 countries and with data from more than 6 million pregnancies.