condition mean min max ZT0-3 30.793816666666665 26.345 33.924549999999996 ZT4-7 22.2879 22.2879 22.2879 ZT8-11 18.11035 18.11035 18.11035 ZT12-15 21.741075000000002 19.89645 23.585700000000003 ZT16-19 37.096450000000004 37.096450000000004 37.096450000000004 ZT20-23 34.6816 34.6816 34.6816