[Monitoring the Paraguayan epidemiological dengue surveillance system (2009-2011) using Benford's law].

Introduction: Dengue is the most widespread arbovirus worldwide. In Paraguay, it reappeared in 1988-1989, with one of the largest epidemic outbreaks occurring in 2011.

Objective: To evaluate the performance of the dengue epidemiological surveillance system in Paraguay between 2009 and 2011.

Predictive model for chloroform during disinfection of water for consumption, city of Montevideo.

The objective of this study was to predict chloroform formation resulting from the process of disinfecting water, particularly trihalomethane which is most frequently produced. A statistical model was used which included repeated measurements of water parameters used for monitoring water quality at 51 sites covering the municipal water system of Montevideo. Samples were taken considering different seasons from June 2009 to July 2011 in Montevideo.

[Identification of users using cluster analysis according to degree of satisfaction with geriatric care services].

The aim of this study was to identify groups of users according to their degree of satisfaction with geriatric care services and determine the primary factors associated with satisfaction. This was a cross-sectional study of 181 people enrolled in 36 modules pertaining to the State Workers Social Security Institute (ISSSTE) in Mexico. Degree of satisfaction was measured according to the following three areas: general characteristics of services offered, friendliness of staff and infrastructure.