condition mean min max ZT0-3 4.02705 4.02705 4.02705 ZT4-7 11.0931 11.0931 11.0931 ZT8-11 5.60716 5.60716 5.60716 ZT12-15 2.0619899999999998 2.0619899999999998 2.0619899999999998 ZT16-19 2.3692 2.3692 2.3692 ZT20-23 1.99227 1.99227 1.99227