condition mean min max ZT0-3 12.406134 12.406134 12.406134 ZT4-7 21.77212 21.77212 21.77212 ZT8-11 25.603493 25.603493 25.603493 ZT12-15 19.67714 19.67714 19.67714 ZT16-19 10.886151 10.886151 10.886151 ZT20-23 10.1947995 10.1947995 10.1947995