condition mean min max ZT0-3 26.897833735 23.10009795 30.69556952 ZT4-7 31.172151235 29.052857645 33.291444825 ZT8-11 29.638488225 28.02675016 31.25022629 ZT12-15 25.789119964999998 24.89884609 26.67939384 ZT16-19 29.548621555 24.787215585 34.310027525 ZT20-23 62.863940405 50.83773902 74.89014179