condition mean min max ZT0-3 1.42638 1.42638 1.42638 ZT4-7 1.9578799999999998 1.9578799999999998 1.9578799999999998 ZT8-11 0.8700924999999999 0.8700924999999999 0.8700924999999999 ZT12-15 0.9648895 0.9648895 0.9648895 ZT16-19 0.7941015 0.7941015 0.7941015 ZT20-23 1.1136300000000001 1.1136300000000001 1.1136300000000001