“…Social and demographic variables included age (i.e., [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], and over 35 years old), marital status (i.e., live with husband/wife or sexual partner, do not live with husband/wife or sexual partner), educational level (i.e., primary (<9 years), secondary (9-11 years, community college), college or more (Bachelor's or higher level)), occupation (i.e., students and people permanent or occasional work vs. unemployed), and regions of Ukraine (i.e., Northern/ Western (Kyiv, Poltava, Sumy, Lutsk), Southern (i.e., Simferopol, Odesa, Kherson, Mykolaiv), Eastern (i.e., Kharkiv, Luhansk, Donetsk), Central (Kyrovograd, Cherkasy, Dnipropetrovsk)). Several variables included were related to injection behavior including age of injection drug use initiation (i.e., [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], and 20+ years old), type of injection drugs used in the last 30 days (i.e., opiates only, stimulants only, both opiates and stimulants), and overdose in the last 12 months.…”