condition mean min max ZT0-3 24.691233333333333 11.26305 33.805499999999995 ZT4-7 14.328050000000001 14.328050000000001 14.328050000000001 ZT8-11 27.1015 27.1015 27.1015 ZT12-15 18.65765 18.2536 19.061700000000002 ZT16-19 25.989600000000003 25.989600000000003 25.989600000000003 ZT20-23 38.89905 38.89905 38.89905