Table 2. Characteristics of the studied populations.
| Seroprevalence study | Primary infection study | |||||
|---|---|---|---|---|---|---|
| Hospital database | City laboratory database | p | Hospital database | City laboratory database | p | |
| number | 42880 | 25094 | / | 636 | 2085 | / |
| >19 year old, n (%) | 33654 (78.5) | 16444 (65.5) | <0.01 | 186 (29.2) | 738 (35.4) | <0.01 |
| Mean age ±SD | 42.0±23.8 | 30.0±18.5 | <0.01 | 14.6±11.5 | 18.0±10.6 | <0.01 |
| Year of sample | 2001–2015 | 2008–2015 | / | 2000–2016 | 2008–2015 | / |
| % seropositivity | 88.3 | 82.0 | <0.01 | / | ||
| % of primary infection | / | 1.4 | 7.7 | <0.01 | ||
SD, Standard deviation.