condition mean min max ZT0-3 0.7633128333333333 0.41983899999999996 1.0819805 ZT4-7 0.597588 0.597588 0.597588 ZT8-11 0.6058985 0.6058985 0.6058985 ZT12-15 1.1643572500000001 1.142925 1.1857895 ZT16-19 1.360835 1.360835 1.360835 ZT20-23 1.225325 1.225325 1.225325