condition mean min max ZT0-3 56.880935 56.880935 56.880935 ZT4-7 44.588980500000005 44.588980500000005 44.588980500000005 ZT8-11 40.1946045 40.1946045 40.1946045 ZT12-15 43.829589999999996 43.829589999999996 43.829589999999996 ZT16-19 72.9982545 72.9982545 72.9982545 ZT20-23 65.723861 65.723861 65.723861