TABLE 2.
Increasing clinical severity during the DENV-3 Cuban epidemic, 2001 to 2002
| Parameter | Value for the parameter at the indicated period (wk)a |
|||||
|---|---|---|---|---|---|---|
| 22–32 | 33–36 | 37–40 | 41–44 | 45–48 | 49–52 | |
| No. of confirmed dengue cases | 187 | 534 | 1,857 | 3,185 | 2,647 | 2,356 |
| No. of DHF/DSS cases | 0 | 1 | 6 | 7 | 23 | 32 |
| No. of deaths | 0 | 0 | 0 | 2 | 0 | 1 |
| Proportion of dengue cases with DHF/DSS (%)b | 0 | 0.2 | 0.3 | 0.2 | 0.9 | 1.4 |
| Odds ratio | 1 | 1.72 | 1.17 | 4.64 | 7.25 | |
a
Epidemiological weeks span the following months: weeks 22 to 32, June to August 2001; weeks 33 to 36, August to September 2001; weeks 37 to 40, September to October 2001, weeks 41 to 44, October to November 2001; weeks 45 to 48, November to December 2001; weeks 49 to 52, December 2001 to January 2002.
b
Values based on a chi-square test for the linear trend from epidemiological weeks 33 to 36 and weeks 49 to 52 (P < 0.05).