condition mean min max ZT0-3 424.986371 424.986371 424.986371 ZT4-7 248.35965700000003 248.35965700000003 248.35965700000003 ZT8-11 257.190787 257.190787 257.190787 ZT12-15 278.311803 278.311803 278.311803 ZT16-19 512.2109025 512.2109025 512.2109025 ZT20-23 531.471249 531.471249 531.471249