Scale on smear reaults

Hi, yesterday I had colcoscopy and LLETZ procedure. The Dr explained that since 2016 I’ve been monitored and had a “rating/score/scale” 2 until my most recent smear result of 6. I had yearly smears for 3 years then they decided to leave me for the 3 year period and its now jumped from 2-6. I wonder if anyone knows that this number is in relation to as I can’t find anything on NHS I formation. The Dr performed THE LLETZ and said it went well and would have results in a couple of weeks.
But any indication on the numbers 2 & 6 would be very much appreciated.

Thanks Leanne