 The paper presents analytic formulas for confinement-modified scattering of particles interacting via a van der Waals potential at long range, using quantum defect theory to express elastic and inelastic or reaction collision rates in terms of two dimensionless parameters representing phase and reactivity. Confinement-induced resonances are suppressed due to reactions and completely absent in the universal limit where the short-range loss probability approaches unity. This article was authored by Zbigniew Zyaszek, Christof Jakimski, and Paul S. Julien.