condition mean min max ZT0-3 3.1535266666666666 2.46974 3.6957899999999997 ZT4-7 1.50225 1.50225 1.50225 ZT8-11 0.8871755 0.8871755 0.8871755 ZT12-15 1.06316075 0.7353715 1.3909500000000001 ZT16-19 0.558675 0.558675 0.558675 ZT20-23 1.2456535 1.2456535 1.2456535