condition mean min max ZT0-3 3.8920899999999996 3.51704 4.2671399999999995 ZT4-7 3.2982449999999996 3.2982449999999996 3.2982449999999996 ZT8-11 1.8110650000000001 1.8110650000000001 1.8110650000000001 ZT12-15 0 0 0 ZT16-19 3.00095 3.00095 3.00095 ZT20-23 3.91627 3.91627 3.91627