condition mean min max ZT0-3 0.14065966666666666 0.0 0.421979 ZT4-7 0.2047535 0.2047535 0.2047535 ZT8-11 0.622752 0.622752 0.622752 ZT12-15 1.0460634999999998 0.607175 1.4849519999999998 ZT16-19 0.0 0.0 0.0 ZT20-23 0.226657 0.226657 0.226657