“…In total, 23,468,892 birth records, 18,864,672 marriage records and 13,379,636 death records were examined for this study (the number of records per region, and the years and regions covered, are detailed in (Bush, Powell-Smith, and Freeman 2018)). The available fields for each person's birth record were the first name, middle name(s) and surname, mother's maiden name (where applicable), year of birth, sub-district of the region in which the birth was registered, and identification number.…”