Selected empirical data relating psychiatric hospital morbidity from Lower-Silesian province in the years 1998-2000 was analysed. Official statistics became the main source of information about occurrences and epidemiological processes, because of lack of population studies from the psychiatric domain. Three main limitations of assessing disruption of such processes were pointed: inter-regional moving of patients; imperfection of procedures connected with accumulation of empirical material; influence of various administrative factors. These last exert essential influence on changes of patients "movement coefficients in hospitals during implementation of the Health Care reform in Poland. Number of admitted patients in general and for the first time increased, simultaneously time of stay in the hospital grew shorter. No reasons have been found, for which these observed changes would be able to have reference in real epidemiological processes, quality of treatment. These changes are rather caused by the realisation of the reform, and precisely adaptative mechanisms of the subjects to Health Insurances requirements.