Assessing the Saskatchewan database for outcomes research studies of depression and its treatment.

This study was conducted to evaluate the validity of using the Saskatchewan Health administrative claims databases for conducting depression research. To develop a claims-based definition of depression, we identified a cohort of individuals who began a "new" period of antidepressant use (no use 180 days prior) from which we selected a stratified random sample (n = 600) for medical record abstraction. The medical record diagnosis was used as the gold standard for judging our database definitions of depression. After defining a primary database definition of depression, we tried to refine it using medically probable scenarios and assessed refinement by agreement statistics. Defining depression with ICD9 codes 296 (affective disorders), 309 (adjustment reaction), and 311 (depressive disorders), the sensitivity (Se), specificity (Sp), positive (PV+) and negative predictive (PV-) values were: 71%, 85%, 86%, and 70%, respectively. Algorithms that limited the number of false-negatives resulted in: Se = 84% and PV- = 77% whereas those that limited false-positives resulted in: Sp = 90% and PV+ = 86%. Although our depression definition requires treatment with antidepressants, this definition will allow us to conduct future studies of depression and its treatment using the Saskatchewan Health databases.

Facility and area variation affecting the use of physical restraints in nursing homes.

OBJECTIVES: Various individual characteristics increase a nursing home resident's likelihood of being mechanically restrained. However, there is not good information on the role played by facility characteristics and geographic area in determining the likelihood of physical restraint use. This study investigates the importance of individual, facility, and area indicators in determining the likelihood of restraint use. METHODS: This research uses data on 2,000 nursing home residents receiving care in more than 250 nursing homes in 10 different areas. Resident-level data were collected in 1990 by research nurses using the Minimum Data Set for Nursing Home Resident Assessment and Care Screening. Facility-level data were gathered by telephone interviews with facility staff. The relations among the variables were investigated using contingency tables and multivariate logistic regression models. RESULTS: Controlling for residents' physical and cognitive function, facility characteristics and location had a significant impact on restraint practices. Those facilities with low nurse staffing were more likely to restrain residents. Furthermore, controlling for these factors, restraint practices varied significantly across the geographic areas in the study. CONCLUSIONS: Like hospitals, nursing homes exhibit significant interfacility and regional variation in their clinical practices. Future analyses of nursing home care might benefit from considering both factors in much finer detail.