condition mean min max ZT0-3 2.54174 2.54174 2.54174 ZT4-7 3.9472699999999996 3.9472699999999996 3.9472699999999996 ZT8-11 3.807595 3.807595 3.807595 ZT12-15 2.83683 2.83683 2.83683 ZT16-19 1.54237 1.54237 1.54237 ZT20-23 2.0886649999999998 2.0886649999999998 2.0886649999999998