condition mean min max ZT0-3 1.4254850000000001 1.4254850000000001 1.4254850000000001 ZT4-7 0.961334 0.961334 0.961334 ZT8-11 1.07397 1.07397 1.07397 ZT12-15 1.192815 1.192815 1.192815 ZT16-19 2.063795 2.063795 2.063795 ZT20-23 1.6754799999999999 1.6754799999999999 1.6754799999999999