title: [Simplified indicator of socioeconomic status in short surveys: a proposal based on assets and services].
abstract: OBJECTIVE
  To develop a socioeconomic index for brief surveys that allows a classification in relation to a reference population with a parsimonious approach.
  
  
  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.
authors.affiliation: Centro de Investigación en Evaluación y Encuestas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Díaz-Acosta
authors.affiliation: Centro de Investigación en Evaluación y Encuestas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México.
authors.forename: Andrey Ryo
authors.initials: AR
authors.lastname: Shiba-Matsumoto
authors.affiliation: Centro de Investigación en Evaluación y Encuestas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México.
authors.forename: Juan Pablo
authors.initials: JP
authors.lastname: Gutiérrez
mesh_terms: D001727:Bisexuality / Q000706:statistics & numerical data; D005191:Family Characteristics; D005260:Female; D000067571:Financial Statements; D006296:Health Services / Q000706:statistics & numerical data*; D062985:Health Services for Transgender Persons / Q000706:statistics & numerical data; D018451:Homosexuality, Male / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008800:Mexico; D060386:Sex Workers / Q000706:statistics & numerical data; D012923:Social Class; D011795:Surveys and Questionnaires; D063106:Transgender Persons / Q000706:statistics & numerical data; D014190:Transvestism