condition mean min max ZT0-3 3.6580976666666665 1.109353 6.234254999999999 ZT4-7 2.8634 2.8634 2.8634 ZT8-11 4.713430000000001 4.713430000000001 4.713430000000001 ZT12-15 5.5219225000000005 3.995055 7.04879 ZT16-19 4.64663 4.64663 4.64663 ZT20-23 4.706325 4.706325 4.706325