Table 2 Results of reliability, measurement error, construct validity and ceiling and floor effect analyses for the AxEL-Q
3 Factor model | Construct validity | ICCa | SEMb | MDCc | Ceiling effects | Floor effects | |
|---|---|---|---|---|---|---|---|
Back beliefs questionnaire | Modified pain self-efficacy questionnaire | % Scoring maximum score (%) | % Scoring minimum score | ||||
Factor 1 | − 0.56d | 0.55d | 0.71d | 5.59d | 15.49 | 6.4 | 0 |
(− 0.63 to − 0.48) | (0.46 to 0.62) | ||||||
(0.58 to 0.81) | (4.63 to 6.54) | ||||||
Factor 2 | − 0.50d | 0.37d | 0.73d | 3.51d | 9.73 | 2.9 | 5.1% |
(− 0.58 to − 0.41) | (0.27 to 0.46) | ||||||
(0.60 to 0.82) | (2.96 to 4.06) | ||||||
Factor 3 | − 0.50d | 0.35d | 0.79d | 2.68d | 7.43 | 4.8 | 1.3% |
(− 0.58 to − 0.41) | (0.24 to 0.44) | ||||||
(0.64 to 0.87) | (2.23 to 3.12) | ||||||