2.2. Measurements
The survey included sociodemographic and quality of life (QoL) questions, general information on COVID-19, and a vaccine-specific questionnaire. Self-reported QoL was measured using the culturally validated scale of the EQ-5D-3L Health States instrument.12 The scale consists of a descriptive system for self-reported health status with 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression) with a 3-level response option for each dimension (no problems, some problems, and extreme problems). The EQ-5D-5L index scores ranges at 1 (full health) and 0 (dead), and allows for scores less than 0 representing health states that the population considers worse than being dead.12