condition mean min max ZT0-3 5.7046375000000005 5.19578 6.213495 ZT4-7 3.2934799999999997 3.2934799999999997 3.2934799999999997 ZT8-11 3.2982750000000003 3.2982750000000003 3.2982750000000003 ZT12-15 0 0 0 ZT16-19 4.715535 4.715535 4.715535 ZT20-23 4.94544 4.94544 4.94544