LKM worm?

hello,
i got chkroot details in my mail this morning with everything clear except
Checking `lkm'... You have 5 process hidden for readdir
You have 5 process hidden for ps command
Warning: Possible LKM Trojan installed


Now after few hours when i again did chkrootkit manually it showed nothng like above but this
Checking `lkm'... nothing detected
what does that mean.
does this mean LKM worm never existed or it has hide itself.

please help.

 

 

 

 

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