condition mean min max ZT0-3 4.79552 4.496295 5.094745 ZT4-7 3.793515 3.793515 3.793515 ZT8-11 5.24866 5.24866 5.24866 ZT12-15 0 0 0 ZT16-19 5.3462250000000004 5.3462250000000004 5.3462250000000004 ZT20-23 4.01177 4.01177 4.01177