A study comparing different statistical methods used to remove the effects of selection bias in observational studies finds that results may vary and caution may be warranted when interpreting ...

The validity and reliability of observational methods for studying medication administration errors (MAEs) were studied. Between January and June 1998, two pharmacists observed consecutive drug ...

In observational studies, researchers aim to understand relationships between variables without intervening or manipulating the environment. When an observational study is described as retrospective, ...

Background The link between drinking water salinity and increased blood pressure and hypertension risk among coastal and ...

Observational studies can enroll patients by exposure (eg, type of intervention) using a cohort design or outcome using a case-control design. Cohort studies can be performed prospectively, where ...

Statisticians point out that medical and other observational studies often produce results that are later shown to be incorrect. They now suggest ways to fix the system. S. Stanley Young, assistant ...

This multisite observational study included 470 symptomatic and asymptomatic women who presented for a breast health checkup in two centers. Among them, 238 women had symptoms such as breast lump, ...

After showing two groups of schoolteachers a videotape of an eight-year-old boy, psychologists John Santrock and Russel Tracy found that the teachers’ judgment of the child ultimately depended on ...

Observation of nurses during drug administration at a U.K. hospital did not significantly affect the MAE rate; nor did tactful interventions made by the observers to prevent serious errors. Observer ...