  The CR Yamabe constant is an invariant of a compact strongly pseudoconvex CR
manifold and plays an important role in CR geometry. We show some integral
formulae of the CR Yamabe constant. We also construct an infinite-dimensional
family of strongly pseudoconvex CR structures with varying CR Yamabe constants
and a compact simply-connected manifold admitting two strongly pseudoconvex CR
structures with different signs of the CR Yamabe constant.
