condition mean min max ZT0-3 5.797038 0.5754509999999999 15.604949999999999 ZT4-7 10.517135 10.517135 10.517135 ZT8-11 2.742895 2.742895 2.742895 ZT12-15 2.84063 1.8906399999999999 3.79062 ZT16-19 2.156995 2.156995 2.156995 ZT20-23 0.988546 0.988546 0.988546