Table 3.

Lethal concentrations (LC_1–99) of combined pesticide (chlorpyrifos + cypermethrin) for earthworm, Eudrilus eugeniae (identified by well-defined clitellum, n = 10).

Lethal	Combination pesticidea	95% Confidence limits
Concentration	(μg/cm2)	Lower	Upper
LC1	0.004	0.001	0.007
LC5	0.006	0.002	0.010
LC10	0.008	0.004	0.012
LC15	0.010	0.005	0.013
LC50	0.020	0.015	0.025
LC85	0.040	0.030	0.072
LC90	0.047	0.035	0.096
LC95	0.061	0.042	0.147
LC99	0.097	0.059	0.331
Slope ± SEM	3.35 ± 0.747
Intercept ± SEM	10.72 ± 1.27
Χ2 value	4.43
P	<0.05

Control group (theoretical spontaneous response rate) = 0.000.

^a(Chlorpyrifos + Cypermethrin).