condition mean min max ZT0-3 1.0292145000000001 0.824203 1.4057945 ZT4-7 0.7522599999999999 0.7522599999999999 0.7522599999999999 ZT8-11 2.33421 2.33421 2.33421 ZT12-15 4.0360499999999995 3.89553 4.17657 ZT16-19 3.355295 3.355295 3.355295 ZT20-23 1.89669 1.89669 1.89669