condition mean min max ZT0-3 13.97825 12.688649999999999 15.50765 ZT4-7 14.087399999999999 14.087399999999999 14.087399999999999 ZT8-11 8.505669999999999 8.505669999999999 8.505669999999999 ZT12-15 15.473099999999999 12.3493 18.596899999999998 ZT16-19 9.979095 9.979095 9.979095 ZT20-23 13.549199999999999 13.549199999999999 13.549199999999999