Table 4. Median, the 25th and 75th percentile of weekly cases per sentinel medical institution before and after the issuing of an epidemic warning.
| Weekly cases per sentinel medical institution | |||||||||||
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| Before warning onset | Onset week |
After warning onset | Non-warning weeks |
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| 4weeks | 3weeks | 2weeks | 1week | 1week | 2weeks | 3weeks | 4weeks | ||||
| Influenza-like illness | median | 1.3 | 3.5 | 9.0 | 20.0 | 37.0 | 39.0 | 29.9 | 18.7 | 11.3 | 0.0 |
| 25th percentile | 0.3 | 1.2 | 5.2 | 14.6 | 32.5 | 28.2 | 20.3 | 11.9 | 5.8 | 0.0 | |
| 75th percentile | 4.0 | 7.4 | 14.9 | 25.0 | 44.2 | 52.5 | 44.9 | 30.0 | 18.9 | 0.3 | |
| number of observation | 596 | 596 | 596 | 596 | 596 | 595 | 594 | 586 | 579 | 84,353 | |
| Pharyngoconjunctival fever | median | 0.0 | 0.0 | 0.0 | 0.1 | 1.1 | 0.3 | 0.3 | 0.3 | 0.2 | 0.0 |
| 25th percentile | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| 75th percentile | 0.2 | 0.3 | 0.3 | 0.5 | 1.5 | 1.0 | 0.8 | 0.8 | 0.6 | 0.0 | |
| number of observation | 955 | 955 | 955 | 955 | 955 | 949 | 946 | 942 | 939 | 80,050 | |
| Group A streptococcal pharyngitis | median | 1.3 | 1.5 | 1.9 | 2.0 | 4.5 | 2.8 | 2.3 | 2.3 | 2.0 | 0.4 |
| 25th percentile | 0.7 | 0.7 | 1.0 | 1.3 | 4.0 | 1.5 | 1.2 | 1.0 | 1.0 | 0.0 | |
| 75th percentile | 2.0 | 2.3 | 2.7 | 3.0 | 5.3 | 4.0 | 4.0 | 3.6 | 3.8 | 1.0 | |
| number of observation | 873 | 873 | 873 | 873 | 873 | 870 | 867 | 862 | 854 | 81,355 | |
| Infectious gastroenteritis | median | 6.3 | 8.1 | 11.1 | 15.0 | 23.0 | 21.7 | 18.5 | 14.6 | 12.3 | 2.7 |
| 25th percentile | 3.7 | 5.3 | 8.0 | 12.2 | 21.0 | 16.3 | 12.5 | 9.0 | 8.0 | 0.9 | |
| 75th percentile | 10.0 | 11.6 | 14.0 | 17.5 | 26.3 | 28.3 | 27.4 | 21.8 | 18.3 | 5.8 | |
| number of observation | 1,012 | 1,012 | 1,012 | 1,012 | 1,012 | 1,011 | 1,010 | 1,004 | 996 | 79,140 | |
| Chickenpox | median | 2.7 | 3.0 | 4.3 | 3.3 | 8.0 | 4.0 | 5.5 | 4.0 | 4.3 | 1.0 |
| 25th percentile | 1.5 | 1.5 | 3.0 | 2.0 | 7.3 | 2.7 | 3.6 | 2.3 | 2.5 | 0.3 | |
| 75th percentile | 4.0 | 4.4 | 5.5 | 4.8 | 9.0 | 5.8 | 8.0 | 5.8 | 6.5 | 2.0 | |
| number of observation | 628 | 628 | 628 | 628 | 628 | 624 | 620 | 617 | 613 | 84,541 | |
| Hand-foot-mouth disease | median | 0.8 | 1.3 | 2.0 | 3.0 | 6.0 | 6.1 | 6.1 | 5.3 | 4.5 | 0.0 |
| 25th percentile | 0.2 | 0.5 | 1.0 | 2.0 | 5.3 | 3.7 | 3.0 | 2.3 | 2.0 | 0.0 | |
| 75th percentile | 1.7 | 2.1 | 3.0 | 4.0 | 7.5 | 8.6 | 10.2 | 10.4 | 10.0 | 0.4 | |
| number of observation | 743 | 743 | 743 | 743 | 743 | 743 | 743 | 742 | 741 | 80,735 | |
| Erythema infectiosum | median | 0.5 | 0.5 | 0.7 | 0.8 | 2.3 | 1.1 | 1.0 | 1.0 | 0.8 | 0.0 |
| 25th percentile | 0.0 | 0.0 | 0.2 | 0.3 | 2.0 | 0.5 | 0.4 | 0.3 | 0.3 | 0.0 | |
| 75th percentile | 1.0 | 1.0 | 1.1 | 1.3 | 2.7 | 2.0 | 2.0 | 1.8 | 1.6 | 0.3 | |
| number of observation | 611 | 611 | 611 | 611 | 611 | 609 | 604 | 598 | 593 | 84,750 | |
| Exanthema subtium | median | 1.3 | 1.3 | 1.3 | 1.3 | 4.3 | 2.0 | 2.0 | 1.8 | 1.7 | 0.6 |
| 25th percentile | 0.9 | 1.0 | 0.7 | 1.0 | 4.0 | 1.0 | 1.0 | 1.0 | 0.8 | 0.3 | |
| 75th percentile | 2.3 | 2.0 | 2.0 | 2.5 | 5.0 | 3.0 | 2.7 | 3.0 | 2.7 | 1.0 | |
| number of observation | 133 | 133 | 133 | 133 | 133 | 132 | 131 | 131 | 131 | 90,158 | |
| Pertussis | median | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 25th percentile | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| 75th percentile | 0.0 | 0.0 | 0.0 | 0.0 | 1.3 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | |
| number of observation | 134 | 134 | 134 | 134 | 134 | 133 | 133 | 133 | 133 | 90,271 | |
| Rubella | median | 0.0 | 0.0 | 0.0 | 0.0 | 3.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 25th percentile | 0.0 | 0.0 | 0.0 | 0.0 | 3.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| 75th percentile | 0.3 | 0.8 | 0.3 | 0.7 | 5.0 | 2.0 | 2.0 | 1.0 | 0.0 | 0.0 | |
| number of observation | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 91,409 | |
| Herpangina | median | 0.5 | 1.0 | 2.2 | 3.8 | 7.5 | 8.0 | 7.8 | 6.0 | 4.3 | 0.0 |
| 25th percentile | 0.1 | 0.5 | 1.0 | 2.5 | 6.5 | 5.6 | 4.6 | 3.3 | 2.2 | 0.0 | |
| 75th percentile | 1.3 | 2.0 | 3.3 | 4.9 | 9.2 | 11.3 | 12.0 | 10.5 | 7.7 | 0.3 | |
| number of observation | 972 | 972 | 972 | 972 | 972 | 972 | 972 | 972 | 972 | 77,651 | |
| Measles | median | 0.1 | 0.2 | 0.4 | 0.4 | 1.9 | 0.8 | 0.8 | 0.6 | 0.6 | 0.0 |
| 25th percentile | 0.0 | 0.0 | 0.0 | 0.0 | 1.6 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | |
| 75th percentile | 0.5 | 0.5 | 0.8 | 0.8 | 2.3 | 1.4 | 1.6 | 1.5 | 1.3 | 0.0 | |
| number of observation | 449 | 449 | 449 | 449 | 449 | 444 | 442 | 442 | 440 | 85,802 | |
| Mumps | median | 1.5 | 2.5 | 2.7 | 2.5 | 5.7 | 3.0 | 3.7 | 4.0 | 3.0 | 0.5 |
| 25th percentile | 1.0 | 1.7 | 1.7 | 1.5 | 5.3 | 2.0 | 2.5 | 2.5 | 1.8 | 0.0 | |
| 75th percentile | 2.7 | 3.5 | 3.6 | 3.4 | 6.5 | 4.5 | 5.0 | 5.7 | 4.8 | 1.0 | |
| number of observation | 504 | 504 | 504 | 504 | 504 | 495 | 487 | 480 | 475 | 83,647 | |
The data are expressed as median, the 25th and 75th percentile of cases per week per sentinel medical institution.
The number of observations represents the total number of weeks in which indices fall into the various categories.
The period from the beginning of week in April 1999 till the end of week in March 2002 are used for the analysis.