condition mean min max ZT0-3 363.978964 363.978964 363.978964 ZT4-7 287.06136300000003 287.06136300000003 287.06136300000003 ZT8-11 301.94888149999997 301.94888149999997 301.94888149999997 ZT12-15 381.098667 381.098667 381.098667 ZT16-19 416.23528650000003 416.23528650000003 416.23528650000003 ZT20-23 555.9994675 555.9994675 555.9994675