condition mean min max ZT0-3 48.041575 45.230450000000005 50.8527 ZT4-7 33.93795 33.93795 33.93795 ZT8-11 25.03185 25.03185 25.03185 ZT12-15 0 0 0 ZT16-19 38.915549999999996 38.915549999999996 38.915549999999996 ZT20-23 37.05095 37.05095 37.05095