condition mean min max ZT0-3 25.332804064999998 22.99593784 27.66967029 ZT4-7 18.967743135 16.22012548 21.715360790000002 ZT8-11 21.640558288333335 18.54811519 24.73300138666667 ZT12-15 25.72805245 23.50908786 27.947017040000002 ZT16-19 44.794423339999994 44.42712381333333 45.161722866666665 ZT20-23 31.773135248333332 31.376031016666666 32.17023948