condition mean min max ZT0-3 28.453953 28.453953 28.453953 ZT4-7 39.869875 39.869875 39.869875 ZT8-11 37.993173999999996 37.993173999999996 37.993173999999996 ZT12-15 46.398052 46.398052 46.398052 ZT16-19 56.8330425 56.8330425 56.8330425 ZT20-23 71.182275 71.182275 71.182275