CHANGES IN THE BASIC UNIT WATER VOLUME OF HOUSEHOLD WATER DUE TO COVID-19: ANALYSIS OF THE RELEVANT FACTORS BASED ON QUESTIONNAIRE SURVEY DATA

Abstract

 The purpose of this study is to statistically analyze the changes in the usage of domestic water in response to the COVID-19 pandemic and other relavant factors. In this analysis, the results of a questionnaire survey on water use and the basic unit water volume of each household were used. Specifically, focusing on the ratio of the basic unit water volume in FY2020 (during COVID-19) to FY2019 (before COVID-19), households larger than the standard are referred to as "high group" and households smaller than the standard are referred to as "low group". The binary variables were set as outcomes, and statistical tests of differences and logistic regression analysis were performed. As a result of the analysis, it was clarified that the "change in the number of washings" and "change in the number of cooking for dinner" contributed largely to the group with a high water volume ratio. It was also determined that higher changes in the water volume ratio tended to occur in households that did not include the elderly (65 years old or older) as family members.