Based on the analyses, the actual amount of land area taken up by humans increased between 80 and 150% over the 20 year period. In addition, the number of cats rose anywhere from 25 to 50%. This provided the foundation to develop a realistic estimate of the rise in T. gondii ending up in the ocean. The amount came to 44%. While this may appear to be significant, in terms of the overall area, the potential for spread to otters was considered less than optimal. Another factor had to play a role.