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Table 2 Regression parameters and expected minimum knockdown time (hours) in selected strains of tropical bed bug (C. h) and common bed bug (C. l) exposing to permethrin 0.75%

From: High levels of pyrethroid resistance and super-kdr mutations in the populations of tropical bed bug, Cimex hemipterus, in Iran

Bed bug stain

N

a

b

X2 (df)

H

KT50 (95% CL) hrs

KT90 (95% CL) hrs

KR50

KR90

C. h Ra1

37

− 8.95

2.77

3.16 (11)

0.25

28.54 (25.61–32.09)

82.81 (66.19–115.45)

5.29

5.35

C. h Zn1

36

− 8.04

2.48

0.90 (11)

0.08

29.03 (25.73–33.18)

95.36 (73.28–142.42)

5.38

6.13

C. h Zn2

39

− 7.21

2.23

1.18 (11)

0.10

27.9 (24.53–32.22)

104.40 (78.24–162.2)

5.17

6.71

C. h Zn3

36

− 7.72

2.33

1.01 (11)

0.09

33.25 (32.49–39.07)

117.99 (85.48–195.81)

6.17

7.58

C. l Kh1

33

− 7.09

2.81

24.41 (8)

3.05

5.39 (3.73–7.27)

15.53 (11.79–238.96)

–

–

  1. N = number of individuals, a = intercept of the regression line, b = slope of the regression line, KT = minimum knockdown time, df = degrees of freedom, H = heterogeneity on the Chi-square goodness of fit test, KT50 = median knockdown time in hours, CL = confidence limits, KR = Knockdown time ratio, Ra = Rasht, Zn = Zanjan, Kh = Khodabandeh