condition mean min max ZT0-3 9.368883 9.368883 9.368883 ZT4-7 9.693337 9.693337 9.693337 ZT8-11 9.942142 9.942142 9.942142 ZT12-15 8.8657325 8.8657325 8.8657325 ZT16-19 9.5546355 9.5546355 9.5546355 ZT20-23 9.977881 9.977881 9.977881