condition mean min max ZT0-3 17.5191 15.8095 19.51895 ZT4-7 23.12155 23.12155 23.12155 ZT8-11 26.9861 26.9861 26.9861 ZT12-15 33.07385 30.858649999999997 35.28905 ZT16-19 28.775100000000002 28.775100000000002 28.775100000000002 ZT20-23 24.5365 24.5365 24.5365