condition mean min max ZT0-3 260.292811 260.292811 260.292811 ZT4-7 308.8595115 308.8595115 308.8595115 ZT8-11 382.1885065 382.1885065 382.1885065 ZT12-15 353.76802899999996 353.76802899999996 353.76802899999996 ZT16-19 403.22561499999995 403.22561499999995 403.22561499999995 ZT20-23 312.76095699999996 312.76095699999996 312.76095699999996