condition mean min max ZT0-3 72.88915 69.03715 76.74115 ZT4-7 58.6441 58.6441 58.6441 ZT8-11 31.31795 31.31795 31.31795 ZT12-15 0 0 0 ZT16-19 33.7726 33.7726 33.7726 ZT20-23 68.601 68.601 68.601