Skip to main content

Table 4 Sample size for diagnostic test accuracy study, assuming specificity of 95 % and prevalence of dementia of 75 %

From: Towards improving diagnosis of memory loss in general practice: TIMeLi diagnostic test accuracy study protocol

Lower 95 % confidence interval of specificity Number of healthy people needed for lower confidence interval Number of people with dementia needed for lower confidence interval Total sample size
85 % 93 279 372
80 % 50 150 200
75 % 34 102 136