condition mean min max ZT0-3 15.078532500000001 8.431865 21.7252 ZT4-7 8.629125 8.629125 8.629125 ZT8-11 1.9136549999999999 1.9136549999999999 1.9136549999999999 ZT12-15 0 0 0 ZT16-19 6.849595 6.849595 6.849595 ZT20-23 12.099599999999999 12.099599999999999 12.099599999999999