Context: Health/demography (?) "Disminución en prevalencia de enfermedades - mortalidad en relación con el parto". I have two questions in this sentence: "En prevalencia" I think it may refer to the time a disease remains inside a person (?) Is there any form for saying it in English? "Mortalidad en relación con el parto" is ambiguous, doesn't it? At first I thought it was talking about "death/births rate" but now I think it refers to the deaths caused by childbirths... (I'm afraid I can't give you more context). What do you think? Thanks in advance.