Sample sizes and precision of estimates of sensitivity and specificity from primary studies on the diagnostic accuracy of depression screening tools: a survey of recently published studies

Depression screening tools are useful to the extent that they accurately discriminate between depressed and non-depressed patients. Studies without enough patients to generate precise estimates make it difficult to evaluate accuracy. We conducted a survey of recently published studies on depression screening tool accuracy to evaluate the percentage with sample size calculations; the percentage that provided confidence intervals; and precision, …