Table 5 Cohen’s kappa (κ) coefficient with 95% of CIs to assess the degree of agreement between molecular and serological techniques for the diagnosis of C. burnetii, C. abortus and Leptospira spp.

Number of observed agreements

145 (79.67% of the observations)

103 (56.59% of the observations)

146 (80.22% of the observations)

Number of agreements expected by chance

140.7 (77.33% of the observations)

103.5 (56.85% of the observations)

139.0 (6.37% of the observations)

Kappa (κ)

0.103 ± 0.086

−0.006 ± 0.067

0.163 ± 0.074

95% CIs

−0.065 to 0.272

−0.137 to 0.126

0.018 to 0.308

Strength of agreement

Poor

Poor

Poor