condition mean min max ZT0-3 1.85226 1.1179649999999999 2.586555 ZT4-7 2.06197 2.06197 2.06197 ZT8-11 0.552535 0.552535 0.552535 ZT12-15 0 0 0 ZT16-19 0.7335035 0.7335035 0.7335035 ZT20-23 0.9198160000000001 0.9198160000000001 0.9198160000000001