condition mean min max ZT0-3 54.638075 50.246399999999994 59.02975 ZT4-7 33.93355 33.93355 33.93355 ZT8-11 31.8345 31.8345 31.8345 ZT12-15 0 0 0 ZT16-19 45.6061 45.6061 45.6061 ZT20-23 52.2071 52.2071 52.2071