Some methodological issues about measurements in health Measurement process is a part of everyday work of health professionals. Technological advances have created precise and sensitive instruments whose results are highly accurate and cast little doubts. However, health care has diversified, becoming a multidimensional and complex task. This means that new aspects, that are difficult to measure, must be addressed, such as health perception by patients or cost usefulness ratios of health actions. Therefore, clinicians and researchers must have a good perception of the quality of measures that they use in their daily work, to make the correct diagnostic, therapeutic or prognostic decisions. This article explores the operational concepts that help in the development and assessment of measuring instruments in terms of validity and truthfulness (Rev Méd Chile 2008; 136: 125-30).

RESUMENObjetivo: Comprender los factores relacionados con el embarazo no planificado en las adolescentes, desde la perspectiva de las escolares nuligestas. Método: Estudio cualitativo de casos, en mujeres entre 15 y 19 años, pertenecientes a dos establecimientos educacionales, con altos índices de embarazo, en la ciudad de Temuco, Chile. Se realizaron cuatro grupos focales, constituidos por 14 adolescentes no embarazadas, identificándose factores en las dimensiones individuales, familiares y sociales. Para el análisis se utilizó el programa ATLAS-ti 4,1. Se trianguló por investigador en la ejecución del estudio y análisis de los datos. Resultados: En la dimensión individual aparecen como relevantes factores de riesgo que favorecen el embarazo (FFE): "amor romántico", no uso de métodos anticonceptivos, baja autoestima, irresponsabilidad masculina y falta de conocimiento en sexualidad. En la dimensión familiar destacan los factores: límite estrecho familiar y negligencia paterna. Surgen factores percibidos por las adolescentes como protectoras del embarazo no planificado (FPE), en la dimensión individual destacan: capacidad reflexiva y proyecto de vida; en la dimensión familiar: "familia cuidadora" y límites claros; y en la dimensión social la categoría o factor con mayor peso es "sanción social". Conclusiones: Entre los hallazgos destacan como FFE relevantes el "amor romántico" y los límites polares familiares. Como FPE, la capacidad de reflexión y "familia cuidadora". Estos elementos debieran ser considerados en la prevención del embarazo no planificado en población adolescente. PALABRAS CLAVE: Factores asociados, embarazo no planificado, embarazo en adolescencia SUMMARYObjective: To identify and understand factors associated to pregnancy in adolescents under the perspective of the never pregnant adolescent. Methods: Qualitative study undergone on women 15 to 19 years of age. School based sample of women were drawn from 2 schools chosen due to their high pregnancy rate. Four focus groups were created and each one was composed by 14 eligible women. Factors associated to individuals, to family, and to social environment were studied. Triangulation was performed during the study conduction and data analysis. Analysis was done by using ATLAS-ti 4.1. Results: Factors which appear to be favouring pregnancy at the individuals were: "romantic love", no use of contraceptives, low self esteem, male irresponsibility, lack of knowledge in sexuality. At the family level, the factors are: the permit's restriction

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