condition mean min max ZT0-3 10.307705 10.254660000000001 10.36075 ZT4-7 7.57619 7.57619 7.57619 ZT8-11 7.720305 7.720305 7.720305 ZT12-15 0 0 0 ZT16-19 9.91656 9.91656 9.91656 ZT20-23 10.069585 10.069585 10.069585