Table 4.
Knock-down time and mortality rates of Anopheles arabiensis exposed to Permethrin for a period of 60 min in dry and rainy seasons
| Age (days) | Season | Number tested | 24 h mortality | 95% CI | KDT50 | 95% CI | KDT95 | 95% CI | KDT50 ratio (RR) |
|---|---|---|---|---|---|---|---|---|---|
| 2 | Dry | 800 | 30.8 | 25.7–35.8 | 51.7 | 49.5–54.1 | 144.9 | 135.9–155.3 | 4.1 |
| Rain | 800 | 55.3 | 52.9–57.6 | 48.2 | 46.6–49.9 | 122 | 116.4–128.5 | 3.8 | |
| 3 | Dry | 800 | 43.7 | 38.7–48.8 | 37.7 | 36.1–39.3 | 105.5 | 99.6–112.3 | 3.0 |
| Rain | 800 | 88.8 | 86.3–91.2 | 25.5 | 24.6–26.4 | 64.5 | 61.7–67.6 | 2.0 | |
| 5 | Dry | 800 | 43.8 | 38.8–48.8 | 37.3 | 35.8–38.9 | 104.6 | 98.6–111.3 | 3.0 |
| Rain | 800 | 93.0 | 91.6–94.4 | 16.0 | 15.4–16.6 | 40.6 | 38.8–42.5 | 1.3 | |
| 10 | Dry | 800 | 64.8 | 59.1–70.4 | 22.2 | 21.2–33.3 | 62.36 | 58.8–66.3 | 1.8 |
| Rain | 800 | 97.5 | 95.6–99.4 | 24.5 | 23.7–25.3 | 62.0 | 59.4–64.9 | 1.9 | |
| Controla | Dry | 800 | 100 | – | 12.5 | – | 25.1 | – | – |
| Rain | 800 | 100 | – | 12.6 | – | 24.9 | – | – |
aControl was Anopheles gambiae Kisumu strain aged 2 days old