condition mean min max ZT0-3 13.860875 12.80795 14.9138 ZT4-7 14.03105 14.03105 14.03105 ZT8-11 13.58945 13.58945 13.58945 ZT12-15 0 0 0 ZT16-19 16.6223 16.6223 16.6223 ZT20-23 14.974799999999998 14.974799999999998 14.974799999999998