condition mean min max ZT0-3 3.8559916666666667 2.8754600000000003 4.4149 ZT4-7 1.9477600000000002 1.9477600000000002 1.9477600000000002 ZT8-11 1.63188 1.63188 1.63188 ZT12-15 1.52186 1.2720150000000001 1.7717049999999999 ZT16-19 1.292645 1.292645 1.292645 ZT20-23 2.50028 2.50028 2.50028