condition mean min max ZT0-3 2.0912699999999997 2.0912699999999997 2.0912699999999997 ZT4-7 1.988225 1.988225 1.988225 ZT8-11 2.12889 2.12889 2.12889 ZT12-15 1.923125 1.923125 1.923125 ZT16-19 1.979425 1.979425 1.979425 ZT20-23 1.901535 1.901535 1.901535