condition mean min max ZT0-3 887.121061 887.121061 887.121061 ZT4-7 1136.353668 1136.353668 1136.353668 ZT8-11 523.259127 523.259127 523.259127 ZT12-15 412.265352 412.265352 412.265352 ZT16-19 353.7475955 353.7475955 353.7475955 ZT20-23 656.940362 656.940362 656.940362