condition mean min max ZT0-3 231.95000000000002 231.95000000000002 231.95000000000002 ZT4-7 267.0 267.0 267.0 ZT8-11 406.95 406.95 406.95 ZT12-15 415.45 415.45 415.45 ZT16-19 339.70000000000005 339.70000000000005 339.70000000000005 ZT20-23 261.3 261.3 261.3