condition mean min max ZT0-3 6.946425 5.279534999999999 8.998709999999999 ZT4-7 6.86692 6.86692 6.86692 ZT8-11 5.272545 5.272545 5.272545 ZT12-15 5.73993 4.986855 6.493005 ZT16-19 5.37725 5.37725 5.37725 ZT20-23 8.933365 8.933365 8.933365