condition mean min max ZT0-3 34.410399999999996 34.410399999999996 34.410399999999996 ZT4-7 28.09725 28.09725 28.09725 ZT8-11 30.13895 30.13895 30.13895 ZT12-15 35.468199999999996 35.468199999999996 35.468199999999996 ZT16-19 36.7689 36.7689 36.7689 ZT20-23 36.788900000000005 36.788900000000005 36.788900000000005