Surprising results of the study
By the time 1992 rolled around, the researchers had begun recording where 176,000 of the participants lived. Out of the original participants, 257 women had been diagnosed with Crohn's disease and 313 women had been diagnosed with ulcerative colitis by the year 2003. The women were given categories based upon their location of residence within the United States. The participants were classified based on both their zones (Eastern, Central, Mountain, or Pacific) and climates (southern, middle, or northern).
By the time the research was completed, the researchers had discovered that women who lived in warmer climates were at a decreased risk for developing IBD when compared with the women who lived in colder climates. This finding was increased for the women who were younger than 30.