condition mean min max ZT0-3 11.123672 11.123672 11.123672 ZT4-7 11.533157500000002 11.533157500000002 11.533157500000002 ZT8-11 9.1653675 9.1653675 9.1653675 ZT12-15 10.497732 10.497732 10.497732 ZT16-19 9.6836365 9.6836365 9.6836365 ZT20-23 13.1865145 13.1865145 13.1865145