find files in a given directory, but exclude all subdirectory.

From: bluebirdken (ken.fong_at_hkcg.com)
Date: 10/29/04 

Date: 29 Oct 2004 05:59:23 -0700

I would like use the find command to find files which without modifiy
over 3 days, but I only need the result in a given directory(for
example /etc/), I don't want the result for all other subdirectory
under /etc (for example /etc/bin/ or /etc/logs) , I mean to exclude
all subdirectory under the given direcotry, how can I do that ?
Would someone give me a help, thank you.