Prediction of changes in functional ability of inpatients with schizophrenia using logarithmic and linear regression modelling.

The study enrolled 57 inpatients from a participating hospital, and the authors say a larger number of participants is necessary to investigate reproducibility and responsiveness. The authors say the number of hospitalisation days varied widely in the data used for Analyses 1 and 2. All patients received standard psychotherapy and psychopharmacologic treatment plus occupational therapy, and the paper reports no comparison of these components separately, so the contribution of any component cannot be separated. The authors say further investigation is required to determine whether the predictive model can be applied to inpatients receiving therapies other than occupational therapy. The authors say minimal clinically important difference estimation is required to determine the practicability of the predictive model. The authors say precision must be improved by adding variables such as disease severity. Inter-rater reliability was assessed using data from 13 participants.

Do not conclude that occupational therapy caused the APS score increases. All patients also received standard psychotherapy and psychopharmacologic treatment, and the paper reports no comparison of these components separately, so the contribution of any component cannot be separated.