condition mean min max ZT0-3 117.97773333333333 98.52619999999999 139.11700000000002 ZT4-7 80.5942 80.5942 80.5942 ZT8-11 41.529849999999996 41.529849999999996 41.529849999999996 ZT12-15 55.094725 52.57875 57.6107 ZT16-19 76.2815 76.2815 76.2815 ZT20-23 171.115 171.115 171.115