condition mean min max ZT0-3 1.3451400000000002 1.201615 1.4886650000000001 ZT4-7 2.66593 2.66593 2.66593 ZT8-11 1.335095 1.335095 1.335095 ZT12-15 0 0 0 ZT16-19 1.9853399999999999 1.9853399999999999 1.9853399999999999 ZT20-23 2.6263699999999996 2.6263699999999996 2.6263699999999996