What is contingency table? What is their use in epidemiological research?

A contingency table is a statistical tool used to display the frequency distribution of variables and analyze the relationship between two or more categorical variables. It organizes data into rows and columns, where each cell represents the count of _________ ___ ____ ____ _____ __________ _____ ___ ___ _________.
____ __________ __________ _________ _____ ___.
________ ________ _________ ________ _______ __________ ____.
__________ ________ ___ ____ ________ _________ ______ ____ ________ ________ ___.
_____ _____ _____ ___ _____ _____ ____ ______ ________ ____ ______ ______.
___ ________ ______ ____ ________ __________ _____.
________ __________ ____ _________ ______ _____ ________ _______ ________.
_____ _______ ____ ______ ___ _______ ________ _________ _____.
________ ______ ________ _________ ________ ______ ___ __________.
_____ ___ ___ _____ _______ __________ _________ _______ _____ __________ __________ _________.
________ ______ ____ ________ _____ _______ ___ _________ ______.
_______ ___ ___ _____ _________ ________ ___ ___ _____ ___ _____.
__________ _____ __________ ______ ____ _______ _________ __________ ______ _____ _________.
__________ _____ ______ ____ ___ ________ _________ ________ __________ ____.
____ __________ _________ _________ __________ _____ ________.
_____ ___ ____ _______ _________ __________ _________.
________ _________ _______ ______ ____ __________ ____ _________ __________ __________.
_____ __________ ________.
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