condition mean min max ZT0-3 190.539749 190.539749 190.539749 ZT4-7 162.95387449999998 162.95387449999998 162.95387449999998 ZT8-11 211.335941 211.335941 211.335941 ZT12-15 222.39648649999998 222.39648649999998 222.39648649999998 ZT16-19 255.4002815 255.4002815 255.4002815 ZT20-23 247.0988435 247.0988435 247.0988435