condition mean min max ZT0-3 0.389736575 0.27774515 0.501728 ZT4-7 0.3691535 0.3691535 0.3691535 ZT8-11 0.23393524999999998 0.23393524999999998 0.23393524999999998 ZT12-15 0 0 0 ZT16-19 0.272735 0.272735 0.272735 ZT20-23 0.36533550000000004 0.36533550000000004 0.36533550000000004