condition mean min max ZT0-3 59.286944 59.286944 59.286944 ZT4-7 56.868390000000005 56.868390000000005 56.868390000000005 ZT8-11 49.8621305 49.8621305 49.8621305 ZT12-15 52.400668499999995 52.400668499999995 52.400668499999995 ZT16-19 50.5444175 50.5444175 50.5444175 ZT20-23 50.7725955 50.7725955 50.7725955