condition mean min max ZT0-3 19.587342 19.587342 19.587342 ZT4-7 23.670366 23.670366 23.670366 ZT8-11 34.6836925 34.6836925 34.6836925 ZT12-15 22.6866615 22.6866615 22.6866615 ZT16-19 33.213993 33.213993 33.213993 ZT20-23 21.606013 21.606013 21.606013