condition mean min max ZT0-3 30.438200000000002 30.438200000000002 30.438200000000002 ZT4-7 28.654400000000003 28.654400000000003 28.654400000000003 ZT8-11 30.135599999999997 30.135599999999997 30.135599999999997 ZT12-15 32.39035 32.39035 32.39035 ZT16-19 33.19915 33.19915 33.19915 ZT20-23 27.57695 27.57695 27.57695