<prompt> Translate the following text to EnglishUtaratibu wa kuchelewesha kwa usambazaji ni sawa na kiwango cha wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani wa wastani.  <response>: The distributed lag adjustment factor is constructed as the ratio of the estimated coefficient from the unconstrained distributed lag model to the estimated coefficient from the single-lag model reported in Schwartz 2000. 