condition mean min max ZT0-3 52.71955 52.71955 52.71955 ZT4-7 69.44815 69.44815 69.44815 ZT8-11 51.263850000000005 51.263850000000005 51.263850000000005 ZT12-15 44.320750000000004 44.320750000000004 44.320750000000004 ZT16-19 35.52975 35.52975 35.52975 ZT20-23 46.784850000000006 46.784850000000006 46.784850000000006