condition mean min max ZT0-3 1.4141725 1.1756425 1.788455 ZT4-7 0.820012 0.820012 0.820012 ZT8-11 1.4406850000000002 1.4406850000000002 1.4406850000000002 ZT12-15 1.287053 0.985621 1.588485 ZT16-19 2.027045 2.027045 2.027045 ZT20-23 2.88725 2.88725 2.88725