condition mean min max ZT0-3 434.04999999999995 434.04999999999995 434.04999999999995 ZT4-7 264.8 264.8 264.8 ZT8-11 356.75 356.75 356.75 ZT12-15 622.75 622.75 622.75 ZT16-19 1199.25 1199.25 1199.25 ZT20-23 637.9 637.9 637.9