condition mean min max ZT0-3 50.41415 49.904250000000005 50.924049999999994 ZT4-7 37.02825 37.02825 37.02825 ZT8-11 24.785600000000002 24.785600000000002 24.785600000000002 ZT12-15 0 0 0 ZT16-19 28.310499999999998 28.310499999999998 28.310499999999998 ZT20-23 50.78375 50.78375 50.78375