condition mean min max ZT0-3 164.817948 164.817948 164.817948 ZT4-7 143.9479365 143.9479365 143.9479365 ZT8-11 149.185803 149.185803 149.185803 ZT12-15 200.608913 200.608913 200.608913 ZT16-19 135.822517 135.822517 135.822517 ZT20-23 158.87219 158.87219 158.87219