Table 1.
Relationship between sample size and 95% CIs of a proportion (e.g., a sensitivity or specificity).
^{a}
Sample size
95%CI of a proportion of 0.05
95%CI of a proportion of 0.80
20
0.00–0.25
0.56–0.94
60
0.01–0.14
0.68–0.90
100
0.02–0.11
0.71–0.87
500
0.03–0.07
0.76–0.83
1000
0.04–0.07
0.77–0.82
↵
a
Selected examples of proportions of 0.05 and 0.8.