condition mean min max ZT0-3 120.199065 120.199065 120.199065 ZT4-7 286.9279395 286.9279395 286.9279395 ZT8-11 291.869944 291.869944 291.869944 ZT12-15 254.5012875 254.5012875 254.5012875 ZT16-19 153.44779699999998 153.44779699999998 153.44779699999998 ZT20-23 140.644844 140.644844 140.644844