Table 1. Relationship between sample size and 95% CIs of a proportion (e.g., a sensitivity or specificity).a
Sample size95%CI of a proportion of 0.0595%CI of a proportion of 0.80
200.00–0.250.56–0.94
600.01–0.140.68–0.90
1000.02–0.110.71–0.87
5000.03–0.070.76–0.83
10000.04–0.070.77–0.82
  • a Selected examples of proportions of 0.05 and 0.8.