condition mean min max ZT0-3 0.5150494999999999 0.5150494999999999 0.5150494999999999 ZT4-7 0.33846550000000003 0.33846550000000003 0.33846550000000003 ZT8-11 0.6785905 0.6785905 0.6785905 ZT12-15 2.39508 2.39508 2.39508 ZT16-19 1.723765 1.723765 1.723765 ZT20-23 1.1146585 1.1146585 1.1146585