condition mean min max ZT0-3 31.257266666666666 22.69945 46.8942 ZT4-7 44.746449999999996 44.746449999999996 44.746449999999996 ZT8-11 18.73985 18.73985 18.73985 ZT12-15 37.2 31.34865 43.05135 ZT16-19 44.149100000000004 44.149100000000004 44.149100000000004 ZT20-23 32.29995 32.29995 32.29995