condition mean min max ZT0-3 22.8395 17.18775 27.9965 ZT4-7 16.905900000000003 16.905900000000003 16.905900000000003 ZT8-11 17.549100000000003 17.549100000000003 17.549100000000003 ZT12-15 23.276049999999998 22.54495 24.00715 ZT16-19 25.26455 25.26455 25.26455 ZT20-23 28.220750000000002 28.220750000000002 28.220750000000002