condition mean min max ZT0-3 11.3869 11.3869 11.3869 ZT4-7 9.556895 9.556895 9.556895 ZT8-11 9.444685 9.444685 9.444685 ZT12-15 10.526925 10.526925 10.526925 ZT16-19 13.1403 13.1403 13.1403 ZT20-23 9.811145 9.811145 9.811145