condition mean min max ZT0-3 0.656857 0.6382945 0.6754195000000001 ZT4-7 0.8386955 0.8386955 0.8386955 ZT8-11 0.2941055 0.2941055 0.2941055 ZT12-15 0 0 0 ZT16-19 1.013251 1.013251 1.013251 ZT20-23 0.484526 0.484526 0.484526