condition mean min max ZT0-3 0.4628855 0.4506305 0.47098300000000004 ZT4-7 1.1184720000000001 1.1184720000000001 1.1184720000000001 ZT8-11 0.4645565 0.4645565 0.4645565 ZT12-15 1.6804674999999998 1.4479 1.9130349999999998 ZT16-19 1.762095 1.762095 1.762095 ZT20-23 2.466665 2.466665 2.466665