Table 2.

Sample size values.

Sample Size Calculation for Positive Predictive Value	Sample Size Calculation for Sensitivity and Specificity
Estimated positive predictive value = 0.80 Desired precision = 0.10 Confidence level = 0.95 Total sample size = 62	Estimated sensitivity = 0.40 Estimated specificity = 0.90 Expected prevalence = 0.10 Desired precision = 0.10 Confidence level = 0.95 Total sample size = 931 *

Sample size formulae in Hajian-Tilaki K. Sample size estimation in diagnostic test studies for biomedical informatics. Journal of Biomedical Informatics 2014; 48: 193–204 [22]. * Discrepancy between sample size calculation (931) and number of reviewed health records (962) is due to available resources allowing for the revision and inclusion of 31 additional random records.