Table 2. Mean BI for case and control blocks before, during, after the dengue outbreak, Playa Municipality, Havana, 2000*.
| Block | July–August 2000 (before epidemic), mean (95% CI) |
September–October 2000 (during epidemic), mean (95% CI) |
November–December 2000 (after epidemic), mean (95% CI) |
||||||
|---|---|---|---|---|---|---|---|---|---|
| BI | NBI | BImax | BI | NBI | BImax | BI | NBI | BImax | |
| September case blocks (n = 9) | 0.53 (0.02–1.75) | 1.52 (0.76–2.53) | 6.28† (3.29–10.23) | 11.95† (2.26–29.27) | 10.75† (6.73–15.70) | 28.4† (16.1–44.1) | 0.63 (0.04–1.70) | 0.64 (0.37–0.91) | 2.94 (1.71–4.83) |
| October case blocks (n = 29) | 0.29 (0.05–0.72) | 1.01 (0.60–1.54) | 4.24 (2.48–6.46) | 1.39† (0.50–2.71) | 3.16† (1.99–4.61) | 12.2† (7.79–17.6) | 0.66 (0.06–0.91) | 0.76 (0.44–1.06) | 2.87 (1.50–4.35) |
| Control blocks (n = 38) | 0.20 (0.02–0.58) | 0.69 (0.42–1.02) | 2.96 (1.71–4.56) | 0.42 (0.07–1.05) | 1.52 (0.91–2.29) | 1.52 (3.57–8.32) | 0.33 (0.06–0.82) | 0.68 (0.36–1.18) | 2.34 (1.43–4.27) |
*BI, Breteau index; CI, confidence interval; NBI, neighborhood BI; BImax, maximum BI at the block level for each neighborhood. †Significantly different from corresponding values for control blocks (p<0.05).