condition mean min max ZT0-3 22.358999 22.358999 22.358999 ZT4-7 27.145587499999998 27.145587499999998 27.145587499999998 ZT8-11 40.33613 40.33613 40.33613 ZT12-15 24.6204995 24.6204995 24.6204995 ZT16-19 17.621312500000002 17.621312500000002 17.621312500000002 ZT20-23 16.865985000000002 16.865985000000002 16.865985000000002