condition mean min max ZT0-3 48.494600000000005 42.06825 54.920950000000005 ZT4-7 23.5513 23.5513 23.5513 ZT8-11 24.92035 24.92035 24.92035 ZT12-15 0 0 0 ZT16-19 42.3869 42.3869 42.3869 ZT20-23 40.7526 40.7526 40.7526