Maternal death or maternal mortality is defined by the World Health Organization (WHO) as "the death of a woman while pregnant or within 42 days of termination of pregnancy, irrespective of the duration and site of the pregnancy, from any cause related to or aggravated by the pregnancy or its management but not from accidental or incidental causes." These maternal deaths are divided into two categories: "direct obstetric deaths" and "indirect obstetric deaths." The latter are deaths for which there was a preexisting disease that was aggravated by the pregnancy. Another WHO classification is late maternal death which both direct and indirect deaths that occur after 42 days but less than one year after the pregnancy outcome.