condition mean min max ZT0-3 25.634111 25.634111 25.634111 ZT4-7 28.7317925 28.7317925 28.7317925 ZT8-11 32.724344 32.724344 32.724344 ZT12-15 42.288635 42.288635 42.288635 ZT16-19 23.756985 23.756985 23.756985 ZT20-23 27.298412 27.298412 27.298412