condition mean min max ZT0-3 33.1884 33.1884 33.1884 ZT4-7 30.82885 30.82885 30.82885 ZT8-11 23.081899999999997 23.081899999999997 23.081899999999997 ZT12-15 23.89795 23.89795 23.89795 ZT16-19 26.25985 26.25985 26.25985 ZT20-23 29.988500000000002 29.988500000000002 29.988500000000002