Table 1:

Observer Agreement for Visual CT Features

Observer Sets	No. of Participants	Presence or Absence of Parenchymal Emphysema	Emphysema Grade	Presence or Absence of Paraseptal Emphysema
Observer 1 vs observer 2	1826	0.83 (0.80, 0.86)	0.80 (0.78, 0.82)	0.61 (0.55, 0.66)
Observer 2 vs observer 3	1431	0.80 (0.77, 0.83)	0.69 (0.67, 0.72)	0.80 (0.76, 0.83)
Observer 2 vs observer 4	750	0.83 (0.79, 0.87)	0.75 (0.72, 0.78)	0.68 (0.62, 0.74)
Observer 3 vs observer 4	757	0.79 (0.74, 0.83)	0.70 (0.67, 0.73)	0.77 (0.72, 0.82)
Overall	4166	0.82 (0.80, 0.84)	0.76 (0.74, 0.77)	0.72 (0.69, 0.75)

Note.—Unless otherwise noted, data are κ values, with 95% CIs in parentheses.