condition mean min max ZT0-3 1.5118660285 1.4233425830000002 1.600389474 ZT4-7 2.1698485745 1.312017639 3.02767951 ZT8-11 4.54225798875 4.067138843 5.0173771345 ZT12-15 4.441816804 3.9355952269999994 4.948038381 ZT16-19 4.9675862665 4.5238617095 5.4113108235 ZT20-23 6.8450522455 6.697808049 6.992296442000001