condition mean min max ZT0-3 1.775725 1.646485 1.904965 ZT4-7 4.69553 4.69553 4.69553 ZT8-11 0.6939044999999999 0.6939044999999999 0.6939044999999999 ZT12-15 0 0 0 ZT16-19 2.4291 2.4291 2.4291 ZT20-23 2.713145 2.713145 2.713145