condition mean min max ZT0-3 139.561754 139.561754 139.561754 ZT4-7 40.1815775 40.1815775 40.1815775 ZT8-11 14.034661499999999 14.034661499999999 14.034661499999999 ZT12-15 16.9532895 16.9532895 16.9532895 ZT16-19 12.7854585 12.7854585 12.7854585 ZT20-23 11.477221 11.477221 11.477221