How to associate qualitative variables? An orderly procedure to use of Chi square tests of independence and Logistic Regression

Abstract

In order to test hypotheses in research work, carrying out Chi-square Independence tests or Logistic Regressions, it requires a series of steps from detecting the role of each variable to interpreting the results. The objective of this document is to recommend a procedure of ordered steps for carrying out and interpreting statistical analyzes of qualitative response variables, developed particularly with a pediatric example. Based on the information from the medical records of pediatric patients, under 2 years of age, who were hospitalized with a diagnosis of bronchiolitis, Chi square analyses, logistic regressions (simple and multiple) and Odds Ratios were obtained. The effects on mechanical respiratory support of Tal Score, Respiratory Syncytial Virus and heart rate were significant. It concludes with a functional procedures manual of 8 steps to take into account in order to carry out an optimal analysis procedure.