Table 2.
Topics and questions implemented in the questionnaire of the baseline recruitment of the prevalence, risk factors and impact evaluation of post-COVID-19 condition (PRIME post-COVID) study.
| Topic | Questions | Asked to |
|---|---|---|
| Demographics | Sex | All |
| Year of birth | All | |
| Postal code | All | |
| Residential situation | All | |
| Relationship status | All | |
| Level of education | All | |
| Country of birth | All | |
| COVID-19 test data | Test result | All |
| Test date | All | |
| Vaccination status | All | |
| Vaccination date(s) | All | |
| Vaccination type(s) | All | |
| Presence of antibodies | Negatives | |
| Experienced symptoms | Symptoms when tested | All |
| Symptoms now | All | |
| Severity of symptoms | All | |
| Duration of symptoms | All | |
| Course of symptoms | Positives | |
| Subjective assessment of degree of recovery | Positives | |
| Subjective assessment of having post-COVID-19 condition | Positives | |
| Use of professional medical care | Treatment when tested (hospitalization, duration, and oxygen use) | Positives |
| Received care since test | All | |
| Reason for received care | Positives | |
| Lifestyle | Smoking and substance | All |
| Physical activity [international physical activity questionnaire; IPAQ (26)] | All | |
| Experienced physical and mental health | Underlying disease | All |
| Origination of underlying disease | All | |
| Overall general health | All | |
| Quality of life [EQ-5D-5L (27)] | All | |
| Dyspnoea [modified Medical Research Council; mMRC (28)] | All | |
| Fatigue [checklist individual strength—subscale subjective fatigue; CIS (29)] | All | |
| Mental fatigue [self-constructed based on CIS-Fatigue (30)] | All | |
| Coping [cognitive emotion regulation questionnaire; CERQ (31)] | All | |
| Trauma [PTSD checklist for the DSM-5; PCL-5 (32)] | Positives | |
| Depression [patient health questionnaire-9; PHQ-9 (33)] | All | |
| Loneliness [De Jong-Gierveld (34)] | All | |
| Labor participation | Labor participation [work productivity and activity impairment; WPAI (35)] | All |
| Social participation | Membership to clubs | All |
| Structural and functional social network characteristics assessed with name generator method (36) | Type and number of network members (family, friends, acquaintances, neighbors, colleagues, clubmates, caregivers, others) | All |
| Social support of each member | All | |
| Type of relation with each member | All | |
| Social strain | All | |
| Age of each member | All | |
| Sex of each member | All | |
| Residential distance of each member | All | |
| Type of contact with each member | All |
Question asked to participants tested positive or negatives for COVID-19 only was done using referral based on self-reported test result in questionnaire.