condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0104354875 0.0 0.020870975 ZT16-19 0.033244416666666665 0.022555833333333334 0.043933 ZT20-23 0 0 0