condition mean min max ZT0-3 36.0987 36.0987 36.0987 ZT4-7 24.687 24.687 24.687 ZT8-11 15.252749999999999 15.252749999999999 15.252749999999999 ZT12-15 14.38765 14.38765 14.38765 ZT16-19 21.35125 21.35125 21.35125 ZT20-23 37.55625 37.55625 37.55625