condition mean min max ZT0-3 0.39075800000000005 0.0858805 0.5787155 ZT4-7 0.31851300000000005 0.31851300000000005 0.31851300000000005 ZT8-11 0.082387 0.082387 0.082387 ZT12-15 0.35436225 0.2622485 0.446476 ZT16-19 0.1562495 0.1562495 0.1562495 ZT20-23 0.173062 0.173062 0.173062