condition mean min max ZT0-3 2.6088075 2.095585 3.12203 ZT4-7 2.170455 2.170455 2.170455 ZT8-11 2.358715 2.358715 2.358715 ZT12-15 0 0 0 ZT16-19 3.41859 3.41859 3.41859 ZT20-23 2.095415 2.095415 2.095415