<prompt> Translate the following text to EnglishMifano ya siku nyingi mara nyingi huitwa mifano ya kucheleweshwa kwa usambazaji kwa sababu wanadhani kuwa vifo vinavyofuata tukio la PM vitatolewa kwa siku kadhaa baada ya tukio la PM au kucheleweshwa.  <response>: Multi-day models are often referred to as distributed lag models because they assume that mortality following a PM event will be distributed over a number of days following or lagging the PM event. 