Table 3.

Kappa statistic (κ) of interclassification agreement, 95% CIs, and agreement percentage between sample classification by promoter methylation of HOXA9 and NID2 and by histology on head and neck cancer saliva samples (n = 51)

VariableKappa coefficient
κ (95% CI)Percentage agreement (%)
Oral and oropharyngeal cancer
HOXA90.52 (−0.12–0.42)59
NID20.55 (−0.18–0.37)59
Oral cancer
HOXA90.21 (−0.11–0.52)60
NID20.23 (−0.03–0.49)60