[ENCOPREVENIMSS 2003, 2004 and 2005. 1. Methodology and studied population]. / ENCOPREVENIMSS 2003, 2004 y 2005. 1. Metodología y población estudiada.

In order to assess the progress of preventive health programs by measuring the coverage and other health indicators, ENCOPREVENIMSS (Health National Surveys) 2003, 2004 and 2005 were carried out. These surveys were applied nationwide to population affiliated to the Mexican Institute of Social Security, and were representative at a state level. The sampling frame was stratified, with several stages, by clusters, and had a minimum sample of 328 people per program group in each delegation. The applied questionnaires were previously designed and evaluated through a pilot test. They included specific questions for each program component per age group. In 2004, two sections were added, based on validated instruments to evaluate frequency of food intake and physical activity. A total of 79,797 people were surveyed: 117,884 in 2004, and 122,380 in 2005. A third of the population was insured, while the rest was beneficiary; about half the population was between 20 and 59 years old, and the proportion of people older than 60 increased almost 2% from 2003 to 2005. More than 90% of those who claimed to have a paid job were factory workers or employees. More than 90% of the population were assigned to a family physician in all the assessed years. The information obtained from ENCOPREVENIMSS is a valuable tool to conduct institutional policies for public health.

[Preventable diseases by vaccination. Coverage and impact]. / Enfermedades inmunoprevenibles. Coberturas e impactos de la vacunación.

OBJECTIVE: to evaluate the coverage and impacts of the vaccination component in Integrated Health Programs. MATERIAL AND METHODS: a descriptive study of secondary data analysis was carried out. We analyzed data generated by the Universal Vaccination Program (PROVAC) since 1991, the data compiled in the 2000 National Health Survey (ENSA) and the 2005 National Survey of Coverage of Integrated Health Programs (ENCOPREVENIMSS), as well as the IMSS Annual Epidemiological Gazettes since 1973. RESULTS: the coverage of the basic schemes of the Extended Immunization Program (PAI) in children from one to four years old increased from 46.0% in 1990 to 92.5% in 1992 and 98.2% in 2005. The coverage with booster doses was substantially lower, ranging between 57.0% and 97.3% depending on the type of vaccine and the number of doses. The coverage also varied, although to a lesser extent, among public healthcare institutions. In relation to the impact of the Universal Vaccination Program and the PREVENIMSS strategy among IMSS affiliates, we distinguished at least three situations: (1) illnesses in which a drop in incidence predates the Universal Vaccination Program: tuberculous meningitis, diphtheria, whooping cough, and tetanus; (2) illnesses in which the drop in incidence is clearly related to the program: measles, rubella, mumps, and meningitis due to H. influenzae b. (3) illnesses for which the impact has not yet been assessed: hepatitis B. In addition to a drop in the incidence of immunopreventable diseases, we observed changes in the age distribution of cases. CONCLUSIONS: the PREVENIMSS strategy has not interfered with, and in some case has helped to consolidate the achievements of the Universal Vaccination Program. The results of this investigation point to the need to modernize the current system of evaluating coverage and expanding vaccination schemes with booster doses.