condition mean min max ZT0-3 11.3609975 9.891645 12.83035 ZT4-7 14.22805 14.22805 14.22805 ZT8-11 27.59335 27.59335 27.59335 ZT12-15 0 0 0 ZT16-19 33.74865 33.74865 33.74865 ZT20-23 18.34635 18.34635 18.34635