X-ray screening of gastric cancer is broadly used in Japan, although no controlled trial has proved its effectiveness. This study evaluates the impact of an X-ray screening demonstrative intervention to reduce gastric ...

Se documenta por primera vez en Costa Rica, el nivel de susceptibilidad al tétanos y la rubéola en la población femenina costarricense entre los 25 y 29 años. Se encuestó a 805 de las mujeres (93%) que conformaban la ...

To examine the relationship between cervical cancer and oral contraceptive (OC) use, we analyzed data from a population-based, case-control study in Costa Rica. Women aged 25 to 58 years in whom cervical cancer was ...

High levels of nonresponse or inappropriate response to items are a persistent concern in survey research because those who do not answer may not be representative of the study population. Thus nonresponse introduces ...

Costa Rica covers an area of about 50 000 square kilometres. Approximately half of its 2.5 million inhabitants live in rural areas. The economy is based on exports of tropical products, predominantly coffee and ...

Infection within the human T linphotropic virus type I (HTLV-I), a virus associated with two diseases, adult T-cell leukemia lyriphornal and tropical spastic paraparesis/HTLV-I associated myelopathy,2 is prevalent in Panama' ...

Robust data from a voter registry show that Costa Rican nonagenarians have an exceptionally high live expectancy. Mortality at age 90 in Costa Rica is at least 14% lower than an average of 13 high-income countries. This ...

We studied the prevalence of antibody to Herpes simplex virus types 1 and 2 (HSV-1 and HSV-2) in 766 randomly selected Costa Rican women 25-59 years of age in a national household survey in 1984-1985. Overall, 97.1% were ...

Cervical cancer and breast cancer are leading causes of cancer-related morbidity and mortality in Costa Rica. This article reports results of an evaluation of cervical and breast cancer screening practices among Costa ...

Mathematical models bind theory to precise formulations, and by doing so accentuate logical inconsistences in theories and facilitate their testing. In this article we explore the implications of simple mathematical models ...