Table 3.
Number of cholera cases and cholera rates before and during study
| Sari | Nylon | Control | |
|---|---|---|---|
| Pilot phase (18 villages) | |||
| 1997 | |||
| No. of cases | 68 | 99 | 63 |
| Rate | 6.15 | 6.49 | 3.50 |
| 1998 | |||
| No. of cases | 58 | 102 | 81 |
| Rate | 5.15 | 6.51 | 4.42 |
| Jan.–Aug. 1999 | |||
| No. of cases | 33 | 11 | 19 |
| Adjusted cases* | 49.5 | 16.5 | 28.5 |
| Adjusted rate | 4.34 | 1.07 | 1.54 |
| Sep. 1999–Dec. 2000 | |||
| No. of cases | 15 | 15 | 34 |
| Adjusted cases* | 11.25 | 11.25 | 25.5 |
| Adjusted rate | 1.00 | 0.73 | 1.38 |
| Full study (65 villages) | |||
| 1997 | |||
| No. of cases | 162 | 183 | 114 |
| Rate | 3.76 | 4.19 | 2.7 |
| 1998 | |||
| No. of cases | 165 | 177 | 173 |
| Rate | 3.79 | 4.01 | 4.0 |
| 1999 | |||
| No. of cases | 79 | 48 | 93 |
| Rate | 1.8 | 1.08 | 2.14 |
| 2000 | |||
| No. of cases | 22 | 38 | 32 |
| Rate | 0.50 | 0.85 | 0.724 |
| Jan. 2001–July 2002 | |||
| No. of cases | 46 | 52 | 81 |
| Adjusted cases* | 29.05 | 32.84 | 51.15 |
| Adjusted rate | 0.65 | 0.79 | 1.16 |
Cholera rates reported as no. of cases per 1,000 individuals per year. Pilot phase, September 1999–December 2000; full study, January 2001–July 2002.
*
Adjusted cases: 12 (No. of cases/no. of months in period).