condition mean min max ZT0-3 4.70205 4.70205 4.70205 ZT4-7 2.266985 2.266985 2.266985 ZT8-11 4.8421 4.8421 4.8421 ZT12-15 4.47413 4.47413 4.47413 ZT16-19 8.633755 8.633755 8.633755 ZT20-23 6.214375 6.214375 6.214375