condition mean min max ZT0-3 0.531433815 0.301962065 0.7609055650000001 ZT4-7 1.3466184862500001 1.1858636580000002 1.5073733145000001 ZT8-11 3.6967832052499996 2.0751987764999997 5.3183676339999995 ZT12-15 7.8695811634999995 6.6322484015 9.106913925499999 ZT16-19 4.03223946575 3.555769236 4.5087096954999994 ZT20-23 4.010832833249999 3.539330939 4.4823347275