Annex
Sample size required for detecting disease with 99% confidence at 25% prevalence
Effective 14 July 2015 to 27 November 2018Minimum number of animals required to give a 99% confidence of detecting disease if it is present at 25% prevalence.
Population size _________________________ |
Number of animals to be sampled to detect 25% prevalence |
10 |
10 |
15 |
10 |
20 |
11 |
40 |
13 |
60 |
14 |
80 |
15 |
100 |
15 |
150 |
16 |
200 |
16 |
∞ |
16 |
Source: Cannon, R. M. and Roe, R. T. (1982). Livestock disease surveys - a field manual for veterinarians. Australian Government Publishing Service, Canberra.