condition mean min max ZT0-3 1.8420275 1.73397 1.950085 ZT4-7 4.22927 4.22927 4.22927 ZT8-11 2.47652 2.47652 2.47652 ZT12-15 0 0 0 ZT16-19 2.193075 2.193075 2.193075 ZT20-23 2.93896 2.93896 2.93896