condition mean min max ZT0-3 2.2413175 2.18289 2.2997449999999997 ZT4-7 1.7364950000000001 1.7364950000000001 1.7364950000000001 ZT8-11 3.309805 3.309805 3.309805 ZT12-15 0 0 0 ZT16-19 3.05428 3.05428 3.05428 ZT20-23 2.4689 2.4689 2.4689