condition mean min max ZT0-3 1.9662663333333332 0.8523189999999999 2.74618 ZT4-7 4.03728 4.03728 4.03728 ZT8-11 11.6321 11.6321 11.6321 ZT12-15 11.090967500000001 9.264735000000002 12.9172 ZT16-19 4.1478850000000005 4.1478850000000005 4.1478850000000005 ZT20-23 3.11665 3.11665 3.11665