Table 2.

Construct validity: a priori formulated hypothesis

Hypothesis	Correlation value	N	Hypothesis confirmed?
The BBQ was expected to have moderate to high correlation with FABQ-PA	−.573a	106	Yes
The BBQ was expected to have moderate correlation with RMDQ	−.494a	106	Yes
The BBQ was expected to have high correlation with PCS	−.447a	106	No
The BBQ was expected to have low to moderate correlation with NRS	−.138a	101	Yes

^a Significant correlation (< 0.01). BBQ Back Beliefs Questionnaire; NRS Numeric Rating Scale; FABQ Fear-Avoidance Beliefs Questionnaire; RMDQ Roland-Morris Disability Questionnaire; PCS Pain Catastrophizing Scale