condition mean min max ZT0-3 0.8908293333333334 0.5827720000000001 1.1508990000000001 ZT4-7 0.7309775000000001 0.7309775000000001 0.7309775000000001 ZT8-11 0.479718 0.479718 0.479718 ZT12-15 0.8298227499999999 0.8026825 0.856963 ZT16-19 0.9112815000000001 0.9112815000000001 0.9112815000000001 ZT20-23 0.8397549999999999 0.8397549999999999 0.8397549999999999