condition mean min max ZT0-3 24.972025000000002 20.58915 29.3549 ZT4-7 23.37585 23.37585 23.37585 ZT8-11 21.042099999999998 21.042099999999998 21.042099999999998 ZT12-15 0 0 0 ZT16-19 19.800800000000002 19.800800000000002 19.800800000000002 ZT20-23 18.04845 18.04845 18.04845