condition mean min max ZT0-3 35.879999999999995 31.797649999999997 39.96235 ZT4-7 18.557949999999998 18.557949999999998 18.557949999999998 ZT8-11 20.831049999999998 20.831049999999998 20.831049999999998 ZT12-15 0 0 0 ZT16-19 27.49735 27.49735 27.49735 ZT20-23 28.554949999999998 28.554949999999998 28.554949999999998