condition mean min max ZT0-3 27.3986 16.981650000000002 34.658649999999994 ZT4-7 22.201349999999998 22.201349999999998 22.201349999999998 ZT8-11 41.21815 41.21815 41.21815 ZT12-15 39.132075 35.76795 42.4962 ZT16-19 37.93305 37.93305 37.93305 ZT20-23 43.46015 43.46015 43.46015