condition mean min max ZT0-3 12.786239938 9.259612346 16.31286753 ZT4-7 22.9439241675 19.266538760000003 26.621309574999998 ZT8-11 31.9009154675 29.00579217 34.796038765 ZT12-15 16.684372515499998 10.329264599 23.039480431999998 ZT16-19 5.68528265375 5.2556909035 6.114874404 ZT20-23 4.849419911 4.533242852 5.16559697