condition mean min max ZT0-3 413.193519 413.193519 413.193519 ZT4-7 353.3948245 353.3948245 353.3948245 ZT8-11 366.49896750000005 366.49896750000005 366.49896750000005 ZT12-15 380.534842 380.534842 380.534842 ZT16-19 495.04164349999996 495.04164349999996 495.04164349999996 ZT20-23 539.7121015 539.7121015 539.7121015