condition mean min max ZT0-3 0.92902 0.8854315 0.9726085 ZT4-7 2.15787 2.15787 2.15787 ZT8-11 1.42908 1.42908 1.42908 ZT12-15 0 0 0 ZT16-19 0.7705325 0.7705325 0.7705325 ZT20-23 1.6484299999999998 1.6484299999999998 1.6484299999999998