condition mean min max ZT0-3 0.86752839525 0.5412281985 1.193828592 ZT4-7 1.0003874750000001 0.964983068 1.035791882 ZT8-11 2.02417675475 1.95903575 2.0893177595 ZT12-15 1.6941119092499999 1.347597678 2.0406261404999997 ZT16-19 1.85638772625 1.4520551890000002 2.2607202634999997 ZT20-23 2.5149445635000003 2.1674752755 2.8624138515000004