scripting for get stress od a element

Hi,  

i wrote following code to extract mises stress on an element number 500.

mystress = myOdb.steps[Loading].frames[6].fieldOutputs['S'].values[500].mises

it gives value as 93.5MPa. but when i check ODB file, stress of element 409,500,501,502 do not lie around 93.5MPa. all have stress above 160MPa. 

can anybody say, does my code calculate stress other than element 500.