calculation of ID50

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cindylee
cindylee's picture
calculation of ID50

 I'm looking for the method to calculate ID50. I take an example from O.A. Olajide et al (1999). The ID 50 is 36mg/kg, but I have no idea on how to get the result. The graph is not in a linear form. I have tried to turn it into semi log scale, but still unable to get the result. Do anyone of you know the solution? Thanks.

Dose (mg/kg)
paw edema inhibition(%)

10
22

20
22

40
57

80
58