Table 1.
Demographic and behavioural characteristics of the participants
| Variable | Number (Percentage) or median (IQR) |
|---|---|
| Number of household members | 4 (3–4) |
| Male | 295/600 (49.2%) |
| Age (year) | 42 (21–57) |
| High-risk groupa | 46/201 (22.9%)x |
| Smoker | 81/600 (13.5%) |
| Healthcare facility visit | 194/261 (75.5%) |
| Duration of symptoms (days) | 2 (1–3) |
|
Day of healthcare facility visit (days from symptom onset) |
1 (0–2) |
| Patients examined by RIDT | 169/191 (88.5%) |
| Patients diagnosed as influenza at healthcare facility | 101/194 (52.1%) |
| Influenza diagnosed by RIDT | 97/101 (96.0%) |
| Treated by antivirals among influenza cases diagnosed by RIDT | 96/101 (95.0%) |
| Class of antivirals prescribed | |
| Oseltamivir | 22 (37.3%) |
| Baloxavir | 20 (33.9%) |
| Laninamivir | 9 (15.3%) |
| Zanamivir | 4 (6.8%) |
| Unknown | 4 (6.8%) |
| Vaccinated for seasonal influenza | 87 (34.5%) |
| Income level of household | |
| < 50,000 USDb/year | 64 (32.0%) |
|
50,000 USD/year < < 100,000 USD/year |
86 (43.0%) |
| > 100,000 USD/year | 28 (14.0%) |
| Education level of householder | |
| Primary | 1 (0.5%) |
| Secondary | 83 (46.5%) |
| Tertiary | 95 (47.5%) |
| Advanced | 11 (5.5%) |
IQR Interquartile range, RIDT Rapid influenza diagnostic test, USD US dollars
aParticipants who have past medical history associated with high-risk of severe influenza
b1 USD = 100 Japanese yen