condition mean min max ZT0-3 2.0134724999999998 1.983505 2.04344 ZT4-7 3.898965 3.898965 3.898965 ZT8-11 3.376525 3.376525 3.376525 ZT12-15 0 0 0 ZT16-19 3.5244400000000002 3.5244400000000002 3.5244400000000002 ZT20-23 2.083755 2.083755 2.083755