tokens: From surveys , we extract 15 characteristics that can be divided into five categories : 1 ) personality traits : agreeableness , conscientiousness , extraversion , neuroticism , and openness , as measured by the Big - Five personality test ; 2 ) social status : gender , race , religion , and parents ' educations ; 3 ) physical health : sleep quality measured by the Pittsburgh Sleep Quality Index ( PSQI ) ; 4 ) well - being : body image , happiness , health , loneliness , and self - esteem ; and 5 ) mental health : depression measured by the Center for Epidemiological Studies Depression Scale ( CES - D ) test and anxiety measured by the State - Trait Anxiety Inventory ( STAI ) test .