condition mean min max ZT0-3 0.22971021666666666 0.21442699999999998 0.250363 ZT4-7 0.1009415 0.1009415 0.1009415 ZT8-11 0.0348896 0.0348896 0.0348896 ZT12-15 0.31486499999999995 0.2565765 0.37315349999999997 ZT16-19 0.39976 0.39976 0.39976 ZT20-23 0.4427686 0.4427686 0.4427686