Table 2.

Inter-rater and intra-rater reliability (Kappa correlation coefficient) of each BBS-U item (N = 80).

	Inter-Rater Reliability				Intra-Rater Reliability
Items	Rater-1	Rater-2	ICC(Lower–Upper)	Kappa	First Assessment	Second Assessment	ICC(Lower–Upper)	Kappa
1	3.50 ± 0.60	3.53 ± 0.55	0.89(0.83–0.93)	0.86(0.76–0.97)	3.50 ± 0.60	3.48 ± 0.59	0.89(0.84–0.93)	0.86(0.75–0.96)
2	3.50 ± 0.55	3.48 ± 0.55	0.96(0.94–0.97)	0.93(0.85–1.00)	3.50 ± 0.55	3.46 ± 0.55	0.94(0.91–0.96)	0.95(0.89–1.02)
3	3.53 ± 0.55	3.50 ± 0.55	0.96(0.94–0.97)	0.88(0.78–0.98)	3.53 ± 0.55	3.46 ± 0.55	0.90(0.85–0.94)	0.95(0.89–1.02)
4	3.58 ± 0.50	3.55 ± 0.50	0.95(0.92–0.97)	0.87(0.76–0.98)	3.58 ± 0.50	3.60 ± 0.52	0.81(0.71–0.87)	0.95(0.84–1.06)
5	3.25 ± 0.83	3.28 ± 0.84	0.98(0.97–0.99)	0.87(0.77–0.96)	3.25 ± 0.83	3.16 ± 0.80	0.94(0.91–0.96)	0.96(0.91–1.01)
6	3.33 ± 0.85	3.28 ± 0.87	0.97(0.95–0.98)	0.82(0.71–0.94)	3.33 ± 0.85	3.43 ± 0.76	0.79(0.70–0.86)	0.92(0.84–1.00)
7	3.18 ± 0.84	3.15 ± 0.83	0.98(0.97–0.99)	0.90(0.82–0.98)	3.18 ± 0.84	3.16 ± 0.80	0.95(0.93–0.97)	0.96(0.91–1.01)
8	2.85 ± 0.73	2.88 ± 0.72	0.98(0.96–0.98)	0.89(0.79–0.98)	2.85 ± 0.73	2.86 ± 0.67	0.94(0.90–0.96)	0.96(0.90–1.02)
9	2.83 ± 0.90	2.88 ± 0.82	0.97(0.95–0.98)	0.89(0.80–0.98)	2.83 ± 0.90	2.86 ± 0.91	0.93(0.89–0.96)	0.93(0.86–0.99)
10	3.13 ± 0.85	3.13 ± 0.85	1.00(1.00–1.00)	0.86(0.76–0.96)	3.13 ± 0.85	3.09 ± 0.80	0.94(0.90–0.96)	1.00(1.00–1.00)
11	2.78 ± 0.89	2.80 ± 0.91	0.99(0.98–0.99)	0.80(0.70–0.91)	2.78 ± 0.89	3.00 ± 0.89	0.76(0.65–0.84)	0.84(0.74–0.94)
12	2.73 ± 0.84	2.78 ± 0.83	0.97(0.95–0.98)	0.87(0.77–0.96)	2.73 ± 0.84	2.81 ± 0.83	0.94(0.91–0.96)	0.93(0.85–1.00)
13	3.08 ± 0.82	3.13 ± 0.82	0.96(0.95–0.98)	0.89(0.80–0.97)	3.08 ± 0.82	3.18 ± 0.76	0.89(0.83–0.93)	0.93(0.85–1.00)
14	2.30 ± 0.68	2.25 ± 0.74	0.95(0.93–0.97)	0.77(0.65–0.90)	2.30 ± 0.68	2.41 ± 0.69	0.87(0.80–0.91)	0.92(0.79–1.04)
Total	43.68 ± 5.60	43.58 ± 5.58	0.99(0.988–0.995)	0.95(0.90–1.00)	43.68 ± 5.60	43.96 ± 4.91	0.95(0.93–0.97)	0.90(0.79–1.01)

ICC: intra-class correlation coefficient.