condition mean min max ZT0-3 35.192875 33.87885 36.5069 ZT4-7 35.40635 35.40635 35.40635 ZT8-11 33.1135 33.1135 33.1135 ZT12-15 0 0 0 ZT16-19 29.4467 29.4467 29.4467 ZT20-23 27.55885 27.55885 27.55885