condition mean min max ZT0-3 21.57575 21.38795 21.763550000000002 ZT4-7 11.913 11.913 11.913 ZT8-11 2.34488 2.34488 2.34488 ZT12-15 0 0 0 ZT16-19 4.63611 4.63611 4.63611 ZT20-23 17.492150000000002 17.492150000000002 17.492150000000002