condition mean min max ZT0-3 10.3849075 9.874015 10.895800000000001 ZT4-7 10.7822 10.7822 10.7822 ZT8-11 9.499385 9.499385 9.499385 ZT12-15 0 0 0 ZT16-19 14.8188 14.8188 14.8188 ZT20-23 13.620999999999999 13.620999999999999 13.620999999999999