condition mean min max ZT0-3 1.6920620020000001 1.307900366 2.076223638 ZT4-7 0.5457245075 0.36156242799999994 0.7298865870000001 ZT8-11 24.08533493075 5.917894142 42.2527757195 ZT12-15 75.3294180575 70.551063435 80.10777268000001 ZT16-19 41.43492173 33.45281391 49.417029549999995 ZT20-23 19.422935865 18.49715255 20.34871918