condition mean min max ZT0-3 30.439222 30.439222 30.439222 ZT4-7 30.5418605 30.5418605 30.5418605 ZT8-11 33.458325 33.458325 33.458325 ZT12-15 28.931355000000003 28.931355000000003 28.931355000000003 ZT16-19 25.006345500000002 25.006345500000002 25.006345500000002 ZT20-23 30.439222 30.439222 30.439222