condition mean min max ZT0-3 44.93685 40.09115 49.78255 ZT4-7 20.14515 20.14515 20.14515 ZT8-11 25.382199999999997 25.382199999999997 25.382199999999997 ZT12-15 0 0 0 ZT16-19 66.14645 66.14645 66.14645 ZT20-23 36.87435 36.87435 36.87435