condition mean min max ZT0-3 4.664176666666666 1.665765 10.6167 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 7.9485375 3.72908 12.167995 ZT16-19 13.1109 13.1109 13.1109 ZT20-23 1.8736 1.8736 1.8736