The first map displays data from 1950-1969:
The second shows data from 1970-1994:
The first thing you probably notice is that there's a whole lot more red on the second map. This means that more people are suffering from NHL. Several sources have noted a dramatic increase in NHL over the past few decades:
- "Research has documented a steady increase in non-Hodgkin's lymphoma over the past several decades." (ScienceDaily)
- "Non-Hodgkin Lymphoma (NHL) is one of the fastest rising cancers in the developing countries. In many countries, including the US and Canada, the number of new cases diagnosed each year have almost doubled in the past 30 years." (lymphoma.about.com)
- "Between 1973 and 1991, the 73 percent increase in the incidence of non-Hodgkin's lymphoma was one of the largest among the major cancer sites in the United States." (rex.nci.hih.gov)
*Note that these two maps compare NHL mortality rates for white women. To see the maps for other demographics, click here.