condition mean min max ZT0-3 1.5079368987500001 0.536552176 2.4793216215 ZT4-7 4.863261098 3.338460265 6.388061930999999 ZT8-11 7.65324551625 6.64088287 8.6656081625 ZT12-15 5.093545375250001 3.9931172889999997 6.193973461500001 ZT16-19 3.9188652585000003 3.3276427805 4.5100877365 ZT20-23 4.209827446 3.8183621585000003 4.6012927335