condition mean min max ZT0-3 4.878448262499999 4.328118087 5.428778437999999 ZT4-7 4.68255544925 4.031140381 5.333970517499999 ZT8-11 9.9251666125 6.945254272 12.905078953 ZT12-15 19.08387616 16.158584625 22.009167695 ZT16-19 19.096563312500002 17.7420119 20.451114725000004 ZT20-23 13.8498210325 13.12217304 14.577469025