condition mean min max ZT0-3 31.6172415925 24.80967924 38.424803945 ZT4-7 31.0648106525 30.16450909 31.965112215 ZT8-11 23.358637275 23.172673245 23.544601305 ZT12-15 25.379567082499996 22.328630894999996 28.43050327 ZT16-19 26.3766399275 24.185840565 28.56743929 ZT20-23 47.8030837975 41.568920225 54.03724737