Claimant failed to prove that his work activity for this employer caused his underlying disease to worsen or that a change in his condition, if there was any, caused him disability or time loss or required medical services. Weller v. Union Carbide, 288 Or 27, 602 P2d 259 (1979). Moreover, even if his proof had satisfied the Wellertests, his work for this employer was not the last injurious exposure. Inkley v. Forest Fiber Products Co., 288 Or 337, 605 P2d 1175 (1980).

Affirmed.