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.Alternate抄録　本研究の目的は，水使用に関するアンケート調査結果と当該世帯の原単位水量データを用い，コロナ禍における生活用水の利用状況に関する変化とその要因を統計的に分析することである．具体的には，2019年度（コロナ禍前）に対する2020年度（コロナ禍）の原単位水量の比（前年比）に着目し，基準より大きい世帯を「高値群」，小さい世帯を「低値群」とした2値変数をアウトカムに設定し，差の検定及びロジスティック回帰分析を実施した．分析の結果，水量前年比の高値群に「洗濯回数変化」及び「夕食調理回数変化」が寄与する要因となることが明らかとなった．また，家族構成員に高齢者（65歳以上）を含む世帯に比べ，それを含まない世帯での水量前年比の増加変化が多く確認された点も特徴的である．