condition mean min max ZT0-3 23.1521746825 20.94604692 25.358302445 ZT4-7 19.901678670000003 16.749011135 23.054346205 ZT8-11 35.215367345000004 27.172762905 43.257971785 ZT12-15 37.703494645 35.331308359999994 40.075680930000004 ZT16-19 21.2514642075 21.146587965 21.356340449999998 ZT20-23 32.76790113 29.021691935 36.514110325000004