condition mean min max ZT0-3 10.505625 10.505625 10.505625 ZT4-7 13.63825 13.63825 13.63825 ZT8-11 12.9512 12.9512 12.9512 ZT12-15 8.90238 8.90238 8.90238 ZT16-19 8.659875 8.659875 8.659875 ZT20-23 8.26985 8.26985 8.26985