condition mean min max ZT0-3 2.1309925 1.932125 2.32986 ZT4-7 2.12763 2.12763 2.12763 ZT8-11 2.7298299999999998 2.7298299999999998 2.7298299999999998 ZT12-15 0 0 0 ZT16-19 3.966235 3.966235 3.966235 ZT20-23 2.72179 2.72179 2.72179