Table 2.
Knock-down time and mortality rates of Anopheles arabiensis exposed to Lambda-cyhalothrin 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 | 40.4 | 36.1–44.7 | 51.36 | 49.2–53.7 | 126.3 | 118.6–135.1 | 3.4 |
| Rain | 800 | 76.0 | 73.7–78.3 | 18.82 | 18.1–19.6 | 46.07 | 44.8–49.2 | 1.4 | |
| 3 | Dry | 800 | 43.1 | 28.8–57.4 | 57.10 | 54.6–59.7 | 140.4 | 131.5–150.7 | 3.8 |
| Rain | 800 | 81.0 | 78.7–83.3 | 33.35 | 32.2–34.3 | 83.1 | 79.4–87.1 | 2.4 | |
| 5 | Dry | 800 | 79.6 | 57.0–102.2 | 50.33 | 48.1–52.6 | 123.7 | 116.2–132.3 | 3.3 |
| Rain | 800 | 91.8 | 88.9–94.6 | 26.39 | 25.4–27.4 | 53.7 | 51.5–56.2 | 1.9 | |
| 10 | Dry | 800 | 81.7 | 66.7–96.6 | 23.9 | 22.9–25.0 | 58.9 | 55.7–62.5 | 1.6 |
| Rain | 800 | 97.8 | 96.5–99.1 | 34.14 | 32.9–35.3 | 84.9 | 81.2–89.1 | 2.5 | |
| Controla | Dry | 800 | 100 | – | 15.1 | – | 27.6 | – | – |
| Rain | 800 | 100 | – | 13.7 | – | 27.3 | – | – |
aControl was Anopheles gambiae Kisumu strain aged 2 days old