condition mean min max ZT0-3 1.7663625 0.3866575 3.5282150000000003 ZT4-7 0.34851719999999997 0.34851719999999997 0.34851719999999997 ZT8-11 0.182757 0.182757 0.182757 ZT12-15 0.396842 0.1777345 0.6159494999999999 ZT16-19 0.6916005000000001 0.6916005000000001 0.6916005000000001 ZT20-23 0.3945405 0.3945405 0.3945405