condition mean min max ZT0-3 10.477438 10.477438 10.477438 ZT4-7 12.5841995 12.5841995 12.5841995 ZT8-11 10.867369 10.867369 10.867369 ZT12-15 10.620817 10.620817 10.620817 ZT16-19 10.732741 10.732741 10.732741 ZT20-23 10.1050395 10.1050395 10.1050395