Oda gave a definition for Schwarzian derivatives in several complex variables [Oda, T., 1974, On Schwarzian derivatives in several variables (in Japanese). Kokyuroku Research Institute for Mathematical Sciences, Kioto University, 226, 82-85.], which we used in [Herna´ndez, R., Schwarzian derivatives and linear invariant families in C n . Journal of Mathematics (to appear).] to define a Schwarzian operator. In this article, we prove that different kinds of bounds on the norm of the Schwarzian operator imply univalence in the unit ball B n and on convex domains. We adapt Sturm comparison techniques to study the zero sets of a set of linearly independent solutions to a system of differential equations associated with the Schwarzian derivatives.