condition mean min max ZT0-3 0.3287198333333333 0.22656199999999999 0.393128 ZT4-7 0.455535 0.455535 0.455535 ZT8-11 0.557773 0.557773 0.557773 ZT12-15 1.6005399999999999 1.4686249999999998 1.7324549999999999 ZT16-19 1.84911 1.84911 1.84911 ZT20-23 1.007182 1.007182 1.007182