condition mean min max ZT0-3 2.72588 2.72588 2.72588 ZT4-7 2.033145 2.033145 2.033145 ZT8-11 3.0817550000000002 3.0817550000000002 3.0817550000000002 ZT12-15 3.6086150000000004 3.6086150000000004 3.6086150000000004 ZT16-19 3.03667 3.03667 3.03667 ZT20-23 2.26863 2.26863 2.26863