condition mean min max ZT0-3 11.285833333333333 10.59005 12.1257 ZT4-7 11.13555 11.13555 11.13555 ZT8-11 10.20903 10.20903 10.20903 ZT12-15 15.752550000000001 15.10585 16.399250000000002 ZT16-19 11.8725 11.8725 11.8725 ZT20-23 10.68645 10.68645 10.68645