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