ok i have solved the problem although im confused about it.
the module is :
Function CalcPredFVC(age As Long, ethnic As Long, gender As Long, height As Long)
If ([age] >= 20 And [ethnic] = 1 And [gender] = 0) Then
CalcPredFVC = -0.1933 + [height] * [height] * 0.00018642 + [age] * 0.00064 +...