condition mean min max ZT0-3 1.1865785 0.890412 1.482745 ZT4-7 3.50894 3.50894 3.50894 ZT8-11 2.25784 2.25784 2.25784 ZT12-15 0 0 0 ZT16-19 3.030195 3.030195 3.030195 ZT20-23 1.352014 1.352014 1.352014