condition mean min max ZT0-3 25.88250781 25.07852171 26.68649391 ZT4-7 19.6479756825 17.916415385 21.37953598 ZT8-11 30.988514955 24.82963921 37.1473907 ZT12-15 32.83857045 31.419758105 34.257382795 ZT16-19 19.1473827775 16.24432114 22.050444415 ZT20-23 31.207314565 29.031705835000004 33.382923295