condition mean min max ZT0-3 5.0319400000000005 5.0319400000000005 5.0319400000000005 ZT4-7 3.3357599999999996 3.3357599999999996 3.3357599999999996 ZT8-11 4.466385000000001 4.466385000000001 4.466385000000001 ZT12-15 5.254720000000001 5.254720000000001 5.254720000000001 ZT16-19 7.85062 7.85062 7.85062 ZT20-23 5.511935 5.511935 5.511935