condition mean min max ZT0-3 0.12735216666666666 0.0 0.217635 ZT4-7 0.3178185 0.3178185 0.3178185 ZT8-11 0.219912 0.219912 0.219912 ZT12-15 0.17065824999999998 0.119516 0.22180049999999998 ZT16-19 0.36500750000000004 0.36500750000000004 0.36500750000000004 ZT20-23 0.178005 0.178005 0.178005