condition mean min max ZT0-3 1.0806063333333333 1.0806063333333333 1.0806063333333333 ZT4-7 1.0941800000000002 1.0941800000000002 1.0941800000000002 ZT8-11 1.473875 1.473875 1.473875 ZT12-15 1.385625 1.385625 1.385625 ZT16-19 2.60326 2.60326 2.60326 ZT20-23 0.452532 0.452532 0.452532