Morbidity and temporary disability in 1987 to 2000 were analyzed in workers and employees of the Astrakhan gas-refining plant. There is a stable trend of the incidence and mean duration of disability in such groups of diseases as hypertensive disease and cerebrovascular lesions; gastroduodenal ulcer, diseases of the liver, gallbladder, and pancreas; those of the kidney, and urinary tract, infections of the skin and subcutaneous fat, diseases of the osteomuscular system and connective tissue. The average annual rate of increase in the mean duration of a case of ischemic heart disease decreased from 17.2 to 1.4%. There was a change in the trend of the mean duration of a case of acute respiratory infection on the average from +11.9 to -10.7% a year.