condition mean min max ZT0-3 23.437583333333333 17.668 27.90715 ZT4-7 14.773299999999999 14.773299999999999 14.773299999999999 ZT8-11 20.753500000000003 20.753500000000003 20.753500000000003 ZT12-15 28.2148 26.256050000000002 30.17355 ZT16-19 32.1883 32.1883 32.1883 ZT20-23 35.5861 35.5861 35.5861