The adaptation of sport assessment-patella questionnaire into simplified Chinese version: cross-cultural adaptation, reliability and validity

Table 2 Test-retest reliability and ceiling/floor effects of the VISA-PC

	1st-Test (mean ± SD)	2nd-Test (mean ± SD)	ICC (95%CI)	Observed range	Ceiling effect (%)^a
Healthy Group	95.84 ± 5.97 ^b	95.81 ± 5.74	0.994 (0.960–0.998)	78–100	9.09
At-risk Group	91.87 ± 9.03 ^b	91.68 ± 8.99	0.992 (0.982–0.999)	68–99	0.00
Pathological Group	62.49 ± 11.39	62.41 ± 11.12	0.999 (0.998–0.999)	44–88	0.00
Total	83.95 ± 17.06	83.83 ± 16.96	0.999 (0.998–0.999)	44–100	2.34

The 1st-Test was conducted at the beginning of this research (112 patients), the 2nd-Test was conducted one week later to calculate the test-retest reliability (ICC) of the VISA-PC (112 patients)
ICC intra-class correlation coefficient, 95% CI 95% confidence interval, VISA-PC Chinese version of Victorian Institute of Sport Assessment-Patellar Tendinosis questionnaire
^a Percentage of patients with the worst (floor effect) and the best (ceiling effect) condition
^b Significant difference compared to Pathological Group

ISSN: 1477-7525