<prompt> Translate the following text to EnglishKupungua kwa unywaji kulitokea miongoni mwa wagonjwa wenye matatizo ya kiasi kidogo hadi cha wastani na si katika kikundi kidogo cha unywaji mzito zaidi.  <response>: Most of the drinking reduction occurred among the patients with mild to moderate alcohol problems and not in the heaviest drinking subgroup. 