condition mean min max ZT0-3 66.625456 66.625456 66.625456 ZT4-7 59.6727435 59.6727435 59.6727435 ZT8-11 68.6513635 68.6513635 68.6513635 ZT12-15 53.230742 53.230742 53.230742 ZT16-19 71.4644225 71.4644225 71.4644225 ZT20-23 67.7998225 67.7998225 67.7998225