condition mean min max ZT0-3 5.71066 4.91705 7.0640849999999995 ZT4-7 3.6233899999999997 3.6233899999999997 3.6233899999999997 ZT8-11 5.09742 5.09742 5.09742 ZT12-15 12.777474999999999 11.160499999999999 14.394449999999999 ZT16-19 11.692900000000002 11.692900000000002 11.692900000000002 ZT20-23 9.364025 9.364025 9.364025