condition mean min max ZT0-3 23.773736 23.773736 23.773736 ZT4-7 31.739733 31.739733 31.739733 ZT8-11 39.661364 39.661364 39.661364 ZT12-15 33.3221125 33.3221125 33.3221125 ZT16-19 45.3711575 45.3711575 45.3711575 ZT20-23 35.314887 35.314887 35.314887