Neutrosophic Systems with Applications, Vol. 9, 2023 https://doi.org/10.61356/j.nswa.2023.51 S.P.Priyadharshini and F. Nirmala Irudayam, An Analysis of Obesity in School Children during the Pandemic COVID-19 Using Plithogenic Single Valued Fuzzy Sets An Analysis of Obesity in School Children during the Pandemic COVID-19 Using Plithogenic Single Valued Fuzzy Sets S.P.Priyadharshini 1, * and F. Nirmala Irudayam 2 1 Research Scholar, Nirmala College for Women, India; priyadharshini125@gmail.com. 2 Assistant Professor, Nirmala College for Women, India; nirmalairudayam@ymail.com. * Correspondence: priyadharshini125@gmail.com. Abstract: The objective of this research is to examine the perception that school children with obesity, when excluded from organized academic performance and constrained to their residences during the coronavirus epidemic 2019 will reveal negative consequences in health behaviors. To meet the objective, the concept of Plithogenic Single valued fuzzy sets (PSFS) and their aggregation operators were introduced. Based on the proposed theory, an analysis is presented with the case study to highlight its practicality and preciseness. Keywords: Fuzzy Set; Plithogenic Set; Plithogenic Single Valued Fuzzy Set; PSFS Operators. 1. Introduction Global health analysts predict that school closures have worsened the epidemic of childhood obesity rates due to the COVID-19 pandemic. Analysts believe that school shutdowns associated with COVID-19 will double out-of-school time for several children worldwide the previous year and could increase hazard factors involved with a summer break for gaining weight [1-3]. Plithogeny which was introduced in 2017 by Florentine Smarandache [4, 5, 6] is the origination, existence, development, growth, and emergence of various entities from technologies and organic combinations of old objects that are conflicting and/or neutral and/or non-contradictory. A plithogenic set P is a set whose members are characterized by one or more attributes and there may be several values for each attribute. Moreover, it is the generalization of Crisp, Fuzzy, Intuitionistic fuzzy, and Neutrosophic sets. In this research work, we study how the Plithogenic Single valued fuzzy sets (PSFS) [7-10] and their aggregation operators help in analyzing the main factors for an increase in obesity among school children during the pandemic COVID-19 lockdown with the analyst’s fuzzy degree. The uniqueness of this technique is its effectiveness, as the learner does not have to engage with complex operators based on lengthy calculations. The proposed method also has a realistic approach to the need for a broad spectrum that can penetrate alterations according to the need for the social structure provided. 2. Plithogenic Single valued fuzzy sets and its Operators Definition 3.1: Let U be a universal set and P is the subset and P x  be an element. P is called a Plithogenic set which has the form   F F C D P , , , ,   where A is the attribute Values,  is the set of all attributes values that helps in solving an application, F D is the degree of appurtenance and F C is the dissimilarity degree.