condition mean min max ZT0-3 30.918888889999998 30.918888889999998 30.918888889999998 ZT4-7 36.354444443333335 36.354444443333335 36.354444443333335 ZT8-11 27.49 27.49 27.49 ZT12-15 45.41777778 45.41777778 45.41777778 ZT16-19 32.23111111 32.23111111 32.23111111 ZT20-23 31.804444443333335 31.804444443333335 31.804444443333335