condition mean min max ZT0-3 9.894444 9.894444 9.894444 ZT4-7 11.052602 11.052602 11.052602 ZT8-11 11.790554 11.790554 11.790554 ZT12-15 9.74046 9.74046 9.74046 ZT16-19 9.8224795 9.8224795 9.8224795 ZT20-23 10.461699 10.461699 10.461699