Comparisons of Sampling Procedures and Time of Sampling for the Detection of Salmonellain Danish Infected Chicken Flocks Raised in Floor Systems

Table 3 Statistics used for, and results of comparisons between three sample types for the detection of Salmonella in infected chicken flocks.

Statistics	Faecal samples and 2-sock-samples	Faecal samples and 5-sock-samples	2-sock-samples and 5-sock-samples
κ¹ [95% confidence interval]	0.51 [0.23 ; 0.78]	0.38 [0.10 ; 0.65]	0.68 [0.44 ; 0.94]
R' ²	0.27	0.14	0.45
Mcnemar (p-value) ³	0.317	0.083	0.414
OR⁴ [95% confidence interval]	11.1 [2.28 ; 54.0]	6.33 [1.37 ; 29.2]	30.9 [4.91 ; 194]
P_o, P₊,	0.77, 0.68, 0.82	0.70, 0.70, 0.76	0.84, 0.81, 0,86

¹⁾ Cohen's Kappa; ²⁾ Adjusted Rand R'; ³⁾ McNemar's test for marginal symmetry; ⁴⁾ Odds Ratio; ⁵⁾ Proportion of agreement.

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