Table 3

Reader agreement

ComparisonAgreement without indeterminate/borderline casesAgreement including indeterminate/borderline cases
AgreementCohen’s κ (95% CI, p value)AgreementCohen’s κ (95% CI, p value)
Ultrasound inter-reader agreement91.4%0.82 (0.69 to 0.96, p<0.0001)69.6%0.52 (0.38 to 0.66, p<0.0001)
Chest X-ray inter-reader agreement96.9%0.93 (0.84 to 1, p<0.0001)77.5%0.65 (0.53 to 0.78, p<0.0001)
Consensus ultrasound vs consensus chest X-ray agreement92.2%0.83 (0.68 to 0.97, p<0.0001)66.7%0.47 (0.33 to 0.62, p<0.0001)
  • Inter-reader agreement for ultrasound and X-ray separately and between consensus ultrasound and X-ray. The agreement without indeterminate/borderline cases was calculated from those in which no indeterminate/borderline ratings were recorded.