condition mean min max ZT0-3 281.086166 281.086166 281.086166 ZT4-7 144.32452999999998 144.32452999999998 144.32452999999998 ZT8-11 183.9243645 183.9243645 183.9243645 ZT12-15 182.85929750000003 182.85929750000003 182.85929750000003 ZT16-19 243.476401 243.476401 243.476401 ZT20-23 249.1952955 249.1952955 249.1952955