condition mean min max ZT0-3 113.693595 113.693595 113.693595 ZT4-7 66.8060935 66.8060935 66.8060935 ZT8-11 45.351202 45.351202 45.351202 ZT12-15 31.0645465 31.0645465 31.0645465 ZT16-19 82.3137 82.3137 82.3137 ZT20-23 89.8523735 89.8523735 89.8523735