condition mean min max ZT0-3 140.50716666666668 139.044 143.247 ZT4-7 135.8915 135.8915 135.8915 ZT8-11 131.3795 131.3795 131.3795 ZT12-15 112.620325 102.69715 122.5435 ZT16-19 108.61449999999999 108.61449999999999 108.61449999999999 ZT20-23 128.8545 128.8545 128.8545