condition mean min max ZT0-3 78.700321 78.700321 78.700321 ZT4-7 80.5639755 80.5639755 80.5639755 ZT8-11 78.88969349999999 78.88969349999999 78.88969349999999 ZT12-15 69.15819350000001 69.15819350000001 69.15819350000001 ZT16-19 101.4179865 101.4179865 101.4179865 ZT20-23 78.4271985 78.4271985 78.4271985