condition mean min max ZT0-3 9.283325 6.2471 12.31955 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 24.52225 24.52225 24.52225 ZT20-23 6.1934 6.1934 6.1934