condition mean min max ZT0-3 10.9184400575 10.827921845 11.00895827 ZT4-7 6.260348214 6.037679817 6.483016611 ZT8-11 1.65521163025 0.517565521 2.7928577395 ZT12-15 2.9471626690000003 1.2701378035 4.624187534500001 ZT16-19 8.10850357875 8.08693741 8.1300697475 ZT20-23 8.42598539925 7.7483118205 9.103658977999999