The data collection instrument included 20 questions designed to gather data on quarantined residents’ sociodemographic characteristics, feelings, duties, activities, levels of anxiety and HRQoL during the quarantine. The Generalized Anxiety Disorder Seven-item (GAD-7) scale was selected to assess respondents’ symptoms, while the 5-level EQ-5D version (EQ-5D-5L) was used to measure HRQoL. These two scales are discussed briefly below. They were included in the two first sections of the questionnaire. The third section comprised a set of questions assessing the participants’ feelings, duties and activities during the quarantine. Finally, the respondents’ sociodemographic characteristics were covered by nine questions in Portuguese about aspects such as age, gender and education. The edited questionnaire was administered via an online survey platform. The questionnaire’s introduction informed the participants that filling in the questionnaire was regarded as their consent to participate in the study.