Table 4.
Association of birth year with pre‐pandemic seroprevalence in sera collected in 1999, 2006, and 2008 from individuals born in 1984–1995
| Sample collection (year) | Birth year | Number of samples | % positive (95% CI) | P a(Chi‐square test) |
|---|---|---|---|---|
| 1999 | 1990–1993 | 100 | 32 (22·8–41·1) | <0·0001 |
| 1984–1995 without 1990–1993 | 201 | 7·9 (4·2–11·7) | ||
| 2006 | 1990–1993 | 98 | 38·7 (29·1–48·4) | <0·0001 |
| 1984–1995 without 1990–1993 | 151 | 14·5 (8·9–20·2) | ||
| 2008 | 1990–1993 | 78 | 51·2 (40·1–62·3) | <0·0001 |
| 1984–1995 without 1990–1993 | 157 | 15·2 (9·6–20·9) |
a
Chi‐square test compare between those born in 1990–1993 and those born in 1984–1995 without 1990–1993, in the serum collections from 1999, 2006, and 2008.