Table 4.

Internal consistency and test-retest reliability of the SC-FJS

Item	Mean score ± SD	Item-total correlation	Alpha if item removed	ICC values (CIs range)
1	3.44 ± 0.81	0.601	0.902	0.91 (0.88–0.94)
2	3.37 ± 0.91	0.656	0.899	0.88 (0.83–0.91)
3	2.71 ± 1.20	0.670	0.897	0.88 (0.84–0.92)
4	2.73 ± 1.05	0.636	0.899	0.86 (0.81–0.90)
5	3.31 ± 0.93	0.683	0.898	0.89 (0.85–0.92)
6	2.33 ± 1.22	0.654	0.898	0.90 (0.86–0.93)
7	2.30 ± 1.15	0.640	0.899	0.92 (0.88–0.94)
8	1.89 ± 1.28	0.631	0.899	0.91 (0.87–0.93)
9	1.57 ± 1.40	0.650	0.899	0.93 (0.90–0.95)
10	2.02 ± 1.43	0.762	0.893	0.95 (0.93–0.97)
11	1.70 ± 1.45	0.678	0.897	0.91 (0.88–0.94)
12	1.76 ± 1.27	0.476	0.907	0.93 (0.90–0.95)

SC-FJS simplified Chinese version of Forgotten Joint Score, ICC intraclass correlation coefficient, CIs confidence intervals