condition mean min max ZT0-3 5.564658333333333 3.3665700000000003 8.3576 ZT4-7 3.38748 3.38748 3.38748 ZT8-11 1.13055 1.13055 1.13055 ZT12-15 2.3956825 2.019615 2.77175 ZT16-19 2.382765 2.382765 2.382765 ZT20-23 5.1555 5.1555 5.1555