Table 3.

Interobserver agreement between the three Readers (Reader 1: experienced radiologist; Readers 2 and 3: radiology residents)

	Reader 1 vs. Reader 2				Reader 1 vs. Reader 3				Reader 2 vs. Reader 3
	Setting 1 Kappa value [95%CI]	Setting 2 Kappa value [95%CI]	Setting 3 Kappa value [95%CI]	Setting 4 Kappa value [95%CI]	Setting 1 Kappa value [95%CI]	Setting 2 Kappa value [95%CI]	Setting 3 Kappa value [95%CI]	Setting 4 Kappa value [95%CI]	Setting 1 Kappa value [95%CI]	Setting 2 Kappa value [95%CI]	Setting 3 Kappa value [95%CI]	Setting 4 Kappa value [95%CI]
Atelectasis	0.29 [0.17–0.40]	0.34 [0.20–0.48]	0.28 [0.16–0.40]	0.28 [0.14–0.40]	0.23 [0.15–0.31]	0.13 [0.06–0.2]	0.21 [0.13–0.29]	0.14 [0.07–0.22]	0.33 [0.24–0.41]	0.17 [0.1–0.24]	0.31 [0.23–0.4]	0.15 [0.08–0.22]
Consolidation	0.36 [0.27–0.46]	0.38 [0.28–0.48]	0.38 [0.28–0.47]	0.42 [0.33–0.51]	0.34 [0.25–0.44]	0.35 [0.25–0.45]	0.38 [0.28–0.47]	0.34 [0.25–0.44]	0.44 [0.34–0.54]	0.41 [0.31–0.5]	0.42 [0.33–0.52]	0.42 [0.33–0.52]
Interstitial abnormalities	0.38 [0.25–0.5]	0.34 [0.2–0.49]	0.36 [0.24–0.49]	0.33 [0.18–0.47]	0.35 [0.2–0.49]	0.32 [0.16–0.49]	0.35 [0.2–0.49]	0.37 [0.22–0.51]	0.32 [0.19–0.45]	0.43 [0.27–0.58]	0.33 [0.2–0.46]	0.43 [0.29–0.57]
Nodule	0.47 [0.24–0.7]	0.32 [0.11–0.53]	0.47 [0.25–0.68]	0.29 [0.09–0.49]	0.39 [0.20–0.58]	0.29 [0.1–0.47]	0.44 [0.26–0.62]	0.34 [0.17–0.52]	0.37 [0.17–0.57]	0.37 [0.17–0.56]	0.41 [0.22–0.6]	0.30 [0.12–0.47]
Mass	0.25 [0.07–0.44]	0.34 [0.13–0.54]	0.21 [0.03–0.39]	0.30 [0.1–0.5]	0.40 [0.23–0. 57]	0.43 [0.26–0.6]	0.43 [0.26–0.6]	0.40 [0.23–0.57]	0.30 [0.09–0.5]	0.32 [0.12–0.51]	0.23 [0.04–0.42]	0.36 [0.16–0.56]
Pleural effusion	0.62 [0.54–0.71]	0.56 [0.46–0.66]	0.61 [0.52–0.69]	0.60 [0.51–0.69]	0.55 [0.46–0.64]	0.50 [0.41–0.59]	0.50 [0.41–0.59]	0.51 [0.42–0.6]	0.52 [0.43–0.61]	0.47 [0.38–0.56]	0.53 [0.45–0.62]	0.50 [0.41–0.59]
Pneumothorax	0.52 [0.3–0.74]	0.73 [0.51–0.96]	0.59 [0.38–0.8]	0.63 [0.39–0.87]	0.50 [0.29–0.7]	0.68 [0.48–0.89]	0.56 [0.36–0.76]	0.75 [0.57–0.93]	0.63 [0.41–0.85]	0.55 [0.31–0.79]	0.66 [0.45–0.87]	0.55 [0.31–0.79]
Rib fractures	0.54 [0.39–0.69]	0.42 [0.26–0.59]	0.55 [0.41–0.7]	0.49 [0.34–0.63]	0.38 [0.24–0.53]	0.35 [0.22–0.48]	0.40 [0.26–0.53]	0.43 [0.31–0.56]	0.51 [0.38–0.64]	0.37 [0.25–0.5]	0.54 [0.42–0.67]	0.40 [0.27–0.53]