condition mean min max ZT0-3 10.586879 10.586879 10.586879 ZT4-7 9.9243545 9.9243545 9.9243545 ZT8-11 9.977881 9.977881 9.977881 ZT12-15 11.468048 11.468048 11.468048 ZT16-19 10.335103 10.335103 10.335103 ZT20-23 14.543611 14.543611 14.543611