condition mean min max ZT0-3 6.760719999999999 6.335375 7.186064999999999 ZT4-7 17.473025 17.473025 17.473025 ZT8-11 7.594785 7.594785 7.594785 ZT12-15 0 0 0 ZT16-19 17.987245 17.987245 17.987245 ZT20-23 5.71743 5.71743 5.71743