Table 2

Interval between symptoms and diagnosis in weeks

Year, casesMeanRange< 1 week>1 week
1993, 682–2603 (50%)
1994, 39191–1759 (25%)17 (4%)
1995, 609.71–11020 (33%) 36 (60%)
1996, 13216.51–6613 (40%)18 (50%)