condition mean min max ZT0-3 0.75070175 0.64567 0.8557334999999999 ZT4-7 0.9966165 0.9966165 0.9966165 ZT8-11 3.00899 3.00899 3.00899 ZT12-15 0 0 0 ZT16-19 2.612585 2.612585 2.612585 ZT20-23 1.886705 1.886705 1.886705