condition mean min max ZT0-3 3.5571650000000004 3.43078 3.6835500000000003 ZT4-7 3.105735 3.105735 3.105735 ZT8-11 3.392535 3.392535 3.392535 ZT12-15 0 0 0 ZT16-19 3.31149 3.31149 3.31149 ZT20-23 5.5764949999999995 5.5764949999999995 5.5764949999999995