condition mean min max ZT0-3 28.233024999999998 27.92155 28.5445 ZT4-7 25.97555 25.97555 25.97555 ZT8-11 35.72525 35.72525 35.72525 ZT12-15 0 0 0 ZT16-19 45.91935 45.91935 45.91935 ZT20-23 41.1186 41.1186 41.1186