Table 3. The proportion of weeks in which an epidemic warnings were issued in public health center areas in April 1999-March 2002, compared with range of those in 1993-1997.

The proportion of epidemic warning weeks (%)
Diseases	April 1999-March 2000	April 2000-March 2001	April 2001-March 2002	Range(1993-1997)
				minimum	maximum
Influenza-like illness	3.3	0.5	5.5	0.7	10.9
Pharyngoconjunctival fever	3.2	6.4	7.3	1.8	5.0
Group A streptococcal pharyngitis	4.6	7.7	6.4	3.6	5.2
Infectious gastroenteritis	6.5	6.9	6.0	3.6	7.3
Chickenpox	2.8	4.3	2.7	4.1	4.7
Hand-foot-mouth disease	1.7	10.5	5.2	1.0	11.9
Erythema infectiosum	1.7	3.1	6.6	1.2	8.9
Exanthema subtium	0.7	0.5	0.3	1.8	2.7
Pertussis	0.3	0.4	0.1	0.8	2.1
Rubella	0.1	0.1	0.0	1.7	19.6
Herpangina	7.8	6.2	6.7	4.2	6.7
Measles	1.2	3.8	4.5	4.2	8.2
Mumps	2.0	5.9	11.2	3.4	9.5

Data of fiscal years are used in 3 years from 1999 through 2001.

The proportion of epidemic warning weeks: the number of epidemic warnings which were issued in all the public health center area during the fiscal year 1999-2001 divided by the number of weeks in all the public health center area (583 areas) during the fiscal year 1999-2001(157 weeks).