condition mean min max ZT0-3 4.6127975 3.72521 5.500385 ZT4-7 10.93348 10.93348 10.93348 ZT8-11 36.35645 36.35645 36.35645 ZT12-15 0 0 0 ZT16-19 21.426949999999998 21.426949999999998 21.426949999999998 ZT20-23 7.56044 7.56044 7.56044