condition mean min max ZT0-3 3.9815625 3.81426 4.148865 ZT4-7 4.12851 4.12851 4.12851 ZT8-11 4.985810000000001 4.985810000000001 4.985810000000001 ZT12-15 0 0 0 ZT16-19 5.7661 5.7661 5.7661 ZT20-23 5.60064 5.60064 5.60064