Splog Certainty

I was wondering about my stats on the AntiSplog page. I may just be being hit by an individual, but I've gotten shut down by my host for excessive activity while I was on vacation! I took a screenshot of what concerns me. You can distregard the subtle suggestion at the top as an artifact of the screenshot, but my splog certainty at 0% is what concerns me. How am I supposed to understand this? That is, is it saying there is 0% that this is a real blog, ie, 100% certainty that it's a spam blog? Or am I just doing something wrong, per usual?