condition mean min max ZT0-3 0.29634535 0.15180955 0.42751550000000005 ZT4-7 0.16250045000000002 0.16250045000000002 0.16250045000000002 ZT8-11 0.23650700000000002 0.23650700000000002 0.23650700000000002 ZT12-15 0.278322 0.274752 0.28189200000000003 ZT16-19 0.2551485 0.2551485 0.2551485 ZT20-23 0.379432 0.379432 0.379432