Impedance vector displacements after 1 month, by previous contraception method. Impedance vector displacements (arrows) after 1 month. Labels to the vectors represent three groups according to the previous contraception method (as in Figure 2). Overlapping confidence ellipses indicate a comparable change of vectors in the three groups.
Piccoli et al. Nutrition Journal 2008 7:21 doi:10.1186/1475-2891-7-21