condition mean min max ZT0-3 0.09633570000000001 0.0420014 0.16341250000000002 ZT4-7 0.03856965 0.03856965 0.03856965 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0620353 0.03951885 0.08455175000000001 ZT16-19 0.0378181 0.0378181 0.0378181 ZT20-23 0.173873 0.173873 0.173873