condition mean min max ZT0-3 2.861556309 1.649795463 4.073317155 ZT4-7 4.60968632125 3.0790086590000003 6.1403639834999995 ZT8-11 9.94052981475 7.5596596295 12.3214 ZT12-15 19.1938161725 16.79747706 21.590155285 ZT16-19 18.838760202499998 17.728701335 19.94881907 ZT20-23 23.700645837499998 21.956246345 25.44504533