condition mean min max ZT0-3 0.25827468333333337 0.15244855000000002 0.38666500000000004 ZT4-7 0.1862944 0.1862944 0.1862944 ZT8-11 0.22825449999999997 0.22825449999999997 0.22825449999999997 ZT12-15 0.6002832499999999 0.4383845 0.7621819999999999 ZT16-19 0.6509845 0.6509845 0.6509845 ZT20-23 0.5756065 0.5756065 0.5756065