condition mean min max ZT0-3 208.35716666666667 125.63250000000001 351.24699999999996 ZT4-7 284.875 284.875 284.875 ZT8-11 127.011 127.011 127.011 ZT12-15 99.763375 88.19425 111.33250000000001 ZT16-19 96.17295 96.17295 96.17295 ZT20-23 98.61445 98.61445 98.61445