[Simplified indicator of socioeconomic status in short surveys: a proposal based on assets and services]. / Medición simplificada del nivel socioeconómico en encuestas breves: propuesta a partir de acceso a bienes y servicios.

OBJECTIVE: To develop a socioeconomic index for brief surveys that allows a classification in relation to a reference population with a parsimonious approach. MATERIALS AND METHODS: A socioeconomic index was created using assets and use of services indicators to predict income level within a national representative survey of income (ENIGH, National Survey of Households Income and Expenditures) and then tested with data from a survey among key populations (men who have sex with men/transvestite, transgender, transsexual/female sex workers) and compared to an already published indicator. RESULTS: The concordance for quintiles 1, 2, 3, 4, and 5 between the two indexes were 94, 94, 82, 83, and 89%, respectively. The Spearman's rank correlation coefficient was 0.85. CONCLUSIONS: The proposed parsimonious index captures the socioeconomic level heterogeneity in the MSM/TTT/FSW survey. The use of this index is suggested for short surveys because of the next advantages: a) it uses dichotomic variables; b) the variables used do not imply the fulfillment of any statistical assumption; c) it is easily calculated; d) it can be used for comparing groups.

Medición simplificada del nivel socioeconómico en encuestas breves: propuesta a partir de acceso a bienes y servicios / Simplified indicator of socioeconomic status in short surveys: a proposal based on assets and services

Objetivo. Desarrollar un indicador socioeconómico para encuestas breves que permita una clasificación en relación con un criterio poblacional y que resulte parsimonioso. Material y métodos. Se generó un indicador socioeconómico a partir de variables dicotómicas de bienes y servicios. Se obtuvo la correlación de los resultados obtenidos de la Encuesta Nacional de Ingresos y Gastos en los Hogares ENIGH con los de una encuesta breve y se les comparó con los de un indicador construido a partir de un conjunto mayor de variables. Resultados. La concordancia para los quintiles 1, 2, 3, 4 y 5 del indicador amplio y el parsimonioso son 94, 94, 82, 83 y 89%, respectivamente. El coeficiente de correlación por rangos de Spearman fue de 0.85. Conclusiones. El indicador parsimonioso propuesto captura la heterogeneidad del nivel socioeconómico en la encuesta probada. Se sugiere su uso para encuestas breves debido a sus ventajas: a) se elabora con variables dicotómicas; b) las variables base no implican el cumplimiento de algún supuesto estadístico; c) es fácilmente calculado, y d) se puede utilizar para comparar grupos.

Objective. To develop a socioeconomic index for brief surveys that allows a classification in relation to a reference population with a parsimonious approach. Materials and methods. A socioeconomic index was created using assets and use of services indicators to predict income level within a national representative survey of income (ENIGH, National Survey of Households Income and Expenditures) and then tested with data from a survey among key populations (men who have sex with men/transvestite, transgender, transsexual/female sex workers) and compared to an already published indicator. Results. The concordance for quintiles 1, 2, 3, 4, and 5 between the two indexes were 94, 94, 82, 83, and 89%, respectively. The Spearman's rank correlation coefficient was 0.85. Conclusions. The proposed parsimonious index captures the socioeconomic level heterogeneity in the MSM/TTT/FSW survey. The use of this index is suggested for short surveys because of the next advantages: a) it uses dichotomic variables; b) the variables used do not imply the fulfillment of any statistical assumption; c) it is easily calculated; d) it can be used for comparing groups.