TABLE 3

Intra- and Interobserver Variability

	Intraobserver		Interobserver
Parameter	1	2	1 vs. 2	2 vs. 3	1 vs. 3
Ann Arbor	0.91 (0.82–0.97)	0.88 (0.80–0.95)	0.81 (0.69–0.90)	0.79 (0.68–0.86)	0.87 (0.77–0.94)
Extranodal	0.82 (0.70–0.93)	0.86 (0.76–0.96)	0.74 (0.61–0.87)	0.82 (0.71–0.93)	0.76 (0.63–0.89)
No. of nodal groups	0.93 (0.90–0.96)	0.91 (0.87–0.94)	0.83 (0.76–0.89)	0.92 (0.89–0.95)	0.88 (0.83–0.92)
Nodal sites
Cervical^*	0.84 (0.72–0.92)	0.86 (0.78–0.93)	0.81 (0.71–0.90)	0.77 (0.66–0.86)	0.79 (0.68–0.88)
Axillary	0.80 (0.68–0.89)	0.74 (0.61–0.85)	0.69 (0.56–0.81)	0.69 (0.53–0.83)	0.73 (0.60–0.84)
Infraclavicular	0.55 (−0.01–0.89)	0.39 (0.10–0.73)	0.23 (−0.02–0.55)	0.37 (−0.01–0.68)	0.14 (−0.04–0.50)
Hilar	0.82 (0.70–0.95)	0.65 (0.48–0.83)	0.56 (0.37–0.75)	0.58 (0.36–0.79)	0.63 (0.45–0.81)
Pelvic	0.82 (0.70–0.91)	0.68 (0.53–0.81)	0.65 (0.53–0.76)	0.71 (0.60–0.82)	0.68 (0.55–0.79)
Inguinal or femoral	0.82 (0.72–0.91)	0.69 (0.55–0.82)	0.71 (0.59–0.82)	0.76 (0.64–0.87)	0.69 (0.55–0.82)
Mediastinal	0.75 (0.61–0.88)	0.75 (0.61–0.88)	0.75 (0.61–0.88)	0.77 (0.64–0.90)	0.73 (0.59–0.87)
Periaortic	0.77 (0.65–0.90)	0.76 (0.63–0.89)	0.75 (0.62–0.88)	0.81 (0.69–0.93)	0.78 (0.65–0.90)
Mesentery	0.65 (0.47–0.83)	0.61 (0.41–0.81)	0.63 (0.44–0.81)	0.61 (0.41–0.81)	0.67 (0.49–0.85)
Extranodal sites
Spleen	0.84 (0.69–0.99)	0.81 (0.67–0.96)	0.75 (0.57–0.92)	0.81 (0.67–0.96)	0.69 (0.51–0.88)
Bone marrow	0.94 (0.85–0.99)	0.81 (0.67–0.96)	0.76 (0.60–0.92)	0.76 (0.60–0.92)	0.93 (0.84–0.99)
Lung	0.82 (0.58–0.99)	0.90 (0.72–0.99)	0.58 (0.21–0.95)	0.58 (0.21–0.95)	0.65 (0.32–0.97)
Liver	0.95 (0.84–0.99)	0.88 (0.71–0.99)	0.84 (0.66–0.99)	0.78 (0.57–0.99)	0.59 (0.32–0.87)
Bowel	0.71 (0.40–0.99)	0.56 (0.11–0.99)	0.64 (0.35–0.93)	0.59 (0.28–0.91)	0.37 (−0.03–0.76)

↵* Cervical includes supraclavicular and all head and neck nodal stations.
Data are intraclass correlation coefficient for number of nodal groups and κ_w for all other variables, with 95% confidence intervals in parentheses.