Table 4 Knockdown times in minutes of Aedes aegypti and Ae. albopictus exposed to 4% DDT and 0.05% deltamethrin. Estimates are from probit analyses with 95% confidence intervals (CI). Resistance ratios (RRs) are calculated as the ratio of the KDT ₅₀ of the field population to that of the control population

IPB

63 (57.6–71.9)

115.6 (100.7–139.2)

1.2

46.5 (43.2–50.7)

91.4 (82.1–104.8)

1

Sica 1

55.5 (53.4–58.1)

85.2 (80.0–92.1)

1.1

81.4 (70.0–103.5)

133.0 (109.1–180.7)

1.6

Lakouanga

61.2 (57.9–65.5)

98.0 (90.1–108.8)

1.2

48.0 (46.1–50.3)

71.4 (67.0–77.3)

1

Ouango

34.6 (32.6–36.5)

61.1 (57.4–65.7)

0.7

76.6 (65.1–98.0)

172.0 (138.0–237.5)

1.5

Ngongonon 3

40.4 (39.3–41.6)

60.1 (57.9–62.6)

0.8

30.5 (27.8–33.3)

57.4 (52.2–64.8)

0.6

92 Logements

79.8 (69.9–98.5)

127.6 (106.3–169.5)

1.6

65.5 (60.6–78.8)

80.7 (71.1–108.1)

1.3

Reference strain

50.2 (47.3–52.2)

90.4 (85.3–94.)

1

–

–

IPB

14.8(11.9–15.2)

23.5 (21.3–25.8)

1.1

15.8 (8.1–21.5)

27.8 (21.9–48.7)

1.2

Sica 1

21.2 (14.9–26.3)

40 (34.2–54.5)

1.6

26.8 (18.2–33.6)

54.9 (45.4–77.2)

2

Lakouanga

12.1 (10.7–14.7)

27.4 (24.8–29.7)

1

14.3 (11.8–16.1)

23.5 (18–38.1)

1.1

Ouango

23.1(20.3–25.7)

42.01 (38.0–47.7)

1.7

10.1 (4.4–13.6)

24.0 (19.5–34.3)

0.8

Ngongonon 3

14.1 (12.1–15.9)

26.3 (23.6–0.4)

1.1

13.9 (12.5–15.2)

28.1 (26.0–31.0)

1

92 Logements

18.6 (17.8–19.5)

29.3 (27.9–30.9)

1.4

23.6 (13.8–30.9)

45.0 (36.4–67.7)

1.8

Reference strain

13.4 (10.2–14.6)

24.8 (22.3–24.1)

1

–

–