Wednesday, September 2, 2015

Socioeconomic Status and Prevalence of Obesity and Diabetes in a Mexican American Community, Cameron County, Texas, 2004-2007

The environment as well as economic status, race and culture can potentially have an impact on obesity rates across the world. In the United States, Mexican-American people tend to be at a higher risk to have diabetes and become obese. In 2004, a case study similar to the Framingham cohort was conducted in the border town of Brownsville, Texas to test if economic advantages or disadvantages had an impact on obesity.  Due to its proximity to the border and strong Hispanic culture, Brownsville was selected for the location of this study and it became known as the Cameron County Hispanic Cohort.


The 2,000 participants were divided according to their annual income and categorized as “higher SES” or “lower SES”. People were also divided into clusters based off of where they lived. Each participant was measured and weighed so that their BMI could be calculated as well as their waist circumference. Blood samples were taken from each person as well. The “wealthiest” 202 participants as well as the “poorest” 202 participants were compared with age and gender also being another factor included. However, the majority of people that participated were women. It was noted that age had a strong influence on whether or not a person had diabetes with people over the age of 55 at a much higher risk. This was especially prevalent in the lower SES. In addition, it was found that about ten percent of higher income people had diabetes and about twenty one percent of the lower income people had diabetes. Overall, the vast majority of people that were used in this study did not have access to health care and in general the overall health of much of the Mexican American people in this sample was poor. This suggests that genetics, age and economic status are correlated with health.


Fisher-Hoch, S. P., Rentfro, A. R., Wilson, J. G., Salinas, J. J., Reininger, B. M., Restrepo, B. I., ... & Hanis, C. M. (2010). Peer Reviewed: Socioeconomic Status and Prevalence of Obesity and Diabetes in a Mexican American Community, Cameron County, Texas, 2004-2007. Preventing chronic disease,7(3).

Monday, August 31, 2015

Nicaragua's GPSistas: Mapping Boundaries on the Caribbean coast


In GPS World in 1998 Peter H. Dana wrote an article about the self titled, “GPSistas”, who utilize GPS receivers and GIS to produce the first maps their communities have been able to view. Dana begins the article by taking readers back to the year 1979. According to Dana, 1979 was the year that, “…the Sandinistas seized control of the government” (p. 185). This event, therefore, caused a 10-year war, which resulted in hundreds of deaths. At the end of the war, in 1990, the Sandinista government fell. The forests, fishing industry, and other assets of the Nicaraguan coast became resources of interest to people outside of country as well as inside. The high tension surrounding accusation of these assets could have caused a war to break out again inside Nicaragua, however, the CACRC (Central American and Caribbean Research Council) had other plans. They believed that GPS could help to map out resources and boundaries for the Nicaraguans. This GPS project began in 1996, where the author, Mr. Dana, worked as a project geographer. The GPS receivers encountered many problems initially, such as the difficulty to obtain batteries and the moisture present along the coast of Nicaragua. These problems were successfully combated, however, and GPS measurements were taken. The GPS mappers recorded GPS positions in degrees, minutes, and seconds of the World Geodetic System of 1984. A sketch of the point and surroundings was also recorded by the mappers. GPS measuring and theory was then taught to 15 new “investigators” from the coast of Nicaragua. They were then dispatched to use their GPS training in the field to create boundaries. The communities within the boundaries, then formed “blocks” for each of the regions. Nicaragua is also a place with many languages, and each block had their own respective language agreed upon to be placed on their landmarks. Ethnographic data was collected, and symbols and categories were created as necessary. In order to validate the claims made by the GPS mapping systems, the investigators compared measurements with previously completed observations. The data recorded in the notebooks was then converted to digital data to be made into maps. On March 25th, 1998 the community map set was completed.  Although it is unknown how much the maps have aided border negotiations with the blocks and states, Dana has high hopes. The investigators from Nicaragua now call themselves the “GPSistas” and completing the mapping. They hope to keep using GPS and GIS to define boundaries all over Nicaragua.

In this figure, the investigators from the coast that were appointed by CACRC used icons to show the “land-use” categories in Nicaragua. The categories are shown in both the Spanish (top language) and Miskitu (bottom language) languages for easier use in Nicaragua. The categories presented (in order) include, mineral resources, forest production, fishing, agriculture, hunting, livestock grazing, locations of historical importance, religious places, ecological reserves, recreational areas, and locations of transportation and communication infrastructure. These land use symbols were later used as a part of the maps made from the data recorded in the notebooks created by the Nicaraguan investigators on 1:50,000 scale “topographic” maps.

Dana, P. H. (1998). Nicaragua's GPSistas: Mapping their lands on the Caribbean coast. GPS World, 9(9), 32-43.