condition mean min max ZT0-3 964.167872 964.167872 964.167872 ZT4-7 1039.081735 1039.081735 1039.081735 ZT8-11 2306.471342 2306.471342 2306.471342 ZT12-15 1220.5073849999999 1220.5073849999999 1220.5073849999999 ZT16-19 1371.7320570000002 1371.7320570000002 1371.7320570000002 ZT20-23 738.5404865 738.5404865 738.5404865