condition mean min max ZT0-3 6.8741175000000005 6.1858450000000005 7.562390000000001 ZT4-7 4.74365 4.74365 4.74365 ZT8-11 3.864405 3.864405 3.864405 ZT12-15 0 0 0 ZT16-19 5.141645 5.141645 5.141645 ZT20-23 6.1483 6.1483 6.1483