condition mean min max ZT0-3 10.934679 10.934679 10.934679 ZT4-7 14.903189000000001 14.903189000000001 14.903189000000001 ZT8-11 15.225842 15.225842 15.225842 ZT12-15 14.638192 14.638192 14.638192 ZT16-19 15.116636 15.116636 15.116636 ZT20-23 12.885565 12.885565 12.885565