condition mean min max ZT0-3 2.7201500000000003 2.7201500000000003 2.7201500000000003 ZT4-7 2.1838550000000003 2.1838550000000003 2.1838550000000003 ZT8-11 1.675105 1.675105 1.675105 ZT12-15 1.41431 1.41431 1.41431 ZT16-19 1.58894 1.58894 1.58894 ZT20-23 2.20392 2.20392 2.20392