condition mean min max ZT0-3 5.2851075 4.53609 6.0341249999999995 ZT4-7 2.746435 2.746435 2.746435 ZT8-11 3.855715 3.855715 3.855715 ZT12-15 0 0 0 ZT16-19 4.789035 4.789035 4.789035 ZT20-23 4.91359 4.91359 4.91359