Table 2.

Percentage of agreement between the symptomatic and serological diagnoses by gender and for all cases

	Symptomatic diagnostic decision rule results
	Agreement (%)	Kappa	Kappaadj	Kappamax	Significance
Female cases	84.9	0.244	0.699	0.923	0.014
Male cases	82.4	0.281	0.649	0.926	0.020
All cases	84.5	0.289	0.690	0.944	< 0.001

CHIKV = chikungunya virus. The symptomatic diagnostic decision rule that most closely agreed with the serological test results was to diagnose as CHIKV positive a patient presenting with joint pain and any combination of fever, body pain, or rash. The percentage of agreement is shown by gender and for all cases combined, along with the kappa statistic for each. Also shown are adjusted kappa statistics accounting for the high prevalence rates of the disease among the observed cases. The maximum achievable kappa values are shown for comparison. All of the kappa statistics are significant, indicating that each agreement is unlikely to have been by chance.