condition mean min max ZT0-3 12.1922 12.1922 12.1922 ZT4-7 9.10983 9.10983 9.10983 ZT8-11 10.9019 10.9019 10.9019 ZT12-15 10.554649999999999 10.554649999999999 10.554649999999999 ZT16-19 14.6933 14.6933 14.6933 ZT20-23 13.065 13.065 13.065