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Featured researches published by J Narváez.


Annals of Human Biology | 2004

Socio-demographic predictors of age at menarche in a group of Colombian university women

Jorge E. Chavarro; Eduardo Villamor; J Narváez; A. Hoyos

Background: Age at menarche is an important developmental milestone known to be modified by social and environmental factors. The determinants and potential change over time of age at menarche in Colombia are not well documented. Aims: To obtain a current estimate of age at menarche in Colombia and to examine the associations between socio-demographic characteristics and age at menarche. Subjects and methods: Between 1998 and 2001, we obtained recalled age at menarche, socio-demographic characteristics, and physical activity information in a group of 3206 students at the National University of Colombia who completed a self-administered questionnaire. We examined the cross-sectional associations between mean age at menarche and migratory pattern, parental education, socio-economic status indicators, practice of physical activity, and year of birth using linear regression. Results: Mean age at menarche (± SD) was 12.68 ± 1.31. In a multivariate adjusted regression model, age at menarche was positively associated with family size and the practice of at least 2 daily hours of physical activity, and was inversely related to urbanization level, socio-economic status, and year of birth. Conclusions: Socio-economic status is a strong predictor of menarche in this population. There appears to be a trend towards earlier menarche by year of birth.


Vaccine | 2010

Potential epidemiological and economical impact of two rotavirus vaccines in Colombia.

Fernando de la Hoz; Nelson Alvis; J Narváez; natalia cediel; Oscar Gamboa; Martha Velandia

A complete economic study was carried out to assess the economical impact of two rotavirus vaccine in Colombia. A Markov decision model was built to assess the health outcomes from birth to 24 months of age for three hypothetical cohorts: one unvaccinated, one vaccinated with 2 doses of Rotarix and the third, with 3 doses of Rotateq. Without vaccination, the annual number of medical visits by diarrhea in children under 2 years would be 1,293,159 cases, with 105,378 medical visits and 470 deaths (IC95% 295-560) related to rotavirus. Without vaccination, rotavirus disease would cost around USD


Revista Panamericana De Salud Publica-pan American Journal of Public Health | 2010

Impacto económico de la introducción de la vacuna inactivada inyectable contra la poliomielitis en Colombia

Nelson Alvis; Fernando de la Hoz; J Narváez

8 millions including direct and indirect costs. Assuming a cost per dose of USD


Revista de salud publica (Bogota, Colombia) | 2009

Evaluación de la Carga de Enfermedad por el Virus del Papiloma Humano en Bogotá

Fernando De la Hoz-Restrepo; Nelson Alvis-Guzman; J Narváez; Luz Angela Chocontá-Piraquive

7.5, average cost-effectiveness ratio would be USD


Vaccine | 2017

Is Colombia reaching the goals on infant immunization coverage? A quantitative survey from 80 municipalities

J Narváez; May Bibiana Osorio; Carlos Castañeda-Orjuela; Nelson Alvis Zakzuk; Natalia Cediel; Luz Angela Chocontá-Piraquive; Fernando De la Hoz-Restrepo

663/DALY with Rotarix and USD


Acta Tropica | 2017

Combination of five diagnostic tests to estimate the prevalence of hookworm infection among school-aged children from a rural area of colombia

Rafael E. Barreto; J Narváez; Natalia A. Sepúlveda; Fabián C. Velásquez; Sandra C. Díaz; Myriam Consuelo López; Patricia Reyes; Ligia I. Moncada

1391 with Rotateq. When price per dose falls below USD


Revista Medica De Chile | 2010

Theoretical estimation of the epidemiological impact of hepatitis A infection in Colombia

Nelson Alvis; Bibiana Pérez; J Narváez; Martha Velandia; Fernando de la Hoz

7 both vaccines yield a similar average cost-effectiveness ratio (USD


International Archives of Occupational and Environmental Health | 2005

Time to first pregnancy among women working in agricultural production.

Alvaro Javier Idrovo; Luz Helena Sanin; Donald C. Cole; Jorge E. Chavarro; Heidy Cáceres; J Narváez; Mauricio Restrepo

1063/DALY). Incremental cost-effectiveness ratio of Rotateq versus Rotarix was USD


Value in Health | 2009

PRS16 AN ECONOMIC EVALUATION OF A PHARMACOLOGICAL INTERVENTION USING VARENICLINE AS THERAPY FOR SMOKING CESSATION

J Narváez; Nelson Alvis; F de La Hoz; J Orozco; A Porras

7787/DALY. Cost-effectiveness ratio was influenced mainly by vaccine cost and cost per case hospitalized. Other programmatic aspects such as number of doses to be applied, likelihood of completing vaccination schedule with shorter versus longer schedules, and storage space within the chain cold should be considered to make decisions on which vaccine should be introduced. In conclusion, vaccinating against rotavirus in Colombia with either vaccine would be very cost effective. If cost per vaccinated children falls below USD


Value in Health | 2013

Vaccination coverage in colombia, opportunity and factors associated: Results from a national survey

F de La Hoz; B. Osorio; J Narváez

3 per dose vaccination would be cost saving.

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Nelson Alvis

University of Cartagena

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F de La Hoz

National University of Colombia

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Bibiana Pérez

National University of Colombia

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Fernando de la Hoz

National University of Colombia

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L Alvis

University of Cartagena

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A Porras

National University of Colombia

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