condition mean min max ZT0-3 32.615875 31.5086 33.723150000000004 ZT4-7 26.58965 26.58965 26.58965 ZT8-11 27.01365 27.01365 27.01365 ZT12-15 0 0 0 ZT16-19 36.95555 36.95555 36.95555 ZT20-23 35.9461 35.9461 35.9461