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Table 2 Precision of sensitivity and specificity estimation (delirium versus control comparison)

From: Diagnostic test accuracy of a novel smartphone application for the assessment of attention deficits in delirium in older hospitalised patients: a prospective cohort study protocol

Sample size Parameter True level of parameter 95% CI width
500 Sensitivity 0.5 ±0.098
Sensitivity 0.7 ±0090
Sensitivity 0.9 ±0.059
Specificity 0.5 ±0.049
Specificity 0.7 ±0.045
Specificity 0.9 ±0.029
  1. The sensitivity precision in the delirium versus dementia comparison will be identical to the details outlined above, as the size of the delirium target group is unchanged. The dementia group is similar in size to the delirium group, hence the precision of specificity estimation in this comparison will be similar to that given for sensitivity. These estimates are based on a delirium prevalence of 20%