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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