condition mean min max ZT0-3 0.0657401685 0.0 0.131480337 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.009443984166666667 0.0 0.018887968333333335