TABLE 1.
Effective concentrations, heterogeneity (χ2), and slopes of regression for DBB derived from log-probit regressionsa
| Data origin | n | Slope of regression | χ2 | EC01 | EC50 | EC90 | EC99 |
|---|---|---|---|---|---|---|---|
| MHS, 1997 | 53 | 2.5931 | 0.7592 | 0.4720 | 4.3849 | 14.9705 | 40.7325 |
| MHS, 1998 | 38 | 2.8027 | 0.2326 | 0.5872 | 6.5425 | 24.6901 | 72.8930 |
| MS, 1998 | 64 | 3.4183 | 7.2346 | 0.5043 | 8.9403 | 43.5785 | 158.5017 |
| Pooled data (1997 and 1998) | 155 | 3.4246 | 8.4774 | 0.3574 | 6.3637 | 31.0930 | 113.3093 |
a
Effective concentrations (in nmol/liter) are mean values obtained from all samples. Significantly higher EC values from Mae Sot (MS) reflect the lower DBB sensitivity in an area with a higher percentage of mefloquine and quinine resistance. MHS, Mae Hong Son.