The visual analog scale (VAS) demonstrates comparable validity for perennial allergic rhinitis (PAR) and nonallergic rhinitis ...

The maturation threat can operate when biological or psychological changes occur within subjects and these changes may account in part or in total for effects discerned in the study. For example, a ...

An examination of nearly 350 published psychological experiments found that nearly half failed to show that they were based on a valid foundation of empirical evidence, suggesting that a wide swath of ...

Experimental mortality Description of data analysis for study dropouts, or use of intention-to-treat analysis or appropriate statistical analysis Demographics and clinical outcomes tables: statistical ...