condition mean min max ZT0-3 15.88855 10.748750000000001 25.1064 ZT4-7 22.2984 22.2984 22.2984 ZT8-11 21.063650000000003 21.063650000000003 21.063650000000003 ZT12-15 21.051299999999998 20.28615 21.81645 ZT16-19 16.1901 16.1901 16.1901 ZT20-23 15.913799999999998 15.913799999999998 15.913799999999998