condition mean min max ZT0-3 141.410894 141.410894 141.410894 ZT4-7 742.4826625000001 742.4826625000001 742.4826625000001 ZT8-11 1243.6061085000001 1243.6061085000001 1243.6061085000001 ZT12-15 739.412018 739.412018 739.412018 ZT16-19 688.407843 688.407843 688.407843 ZT20-23 490.1901725 490.1901725 490.1901725