condition mean min max ZT0-3 41.0339329125 29.008817305 53.05904852 ZT4-7 23.793147275 18.288779084999998 29.297515465 ZT8-11 28.18482866 26.003465995 30.366191325000003 ZT12-15 19.8169897925 16.25115349 23.382826095 ZT16-19 25.004514795 19.390147515 30.618882075000002 ZT20-23 49.9982764175 47.432514515 52.56403832