Back beliefs in patients with low back pain: a primary care cohort study.

backgroundThe Back Belief Questionnaire (BBQ) measures beliefs about negative consequences of back pain. The aim of this study was to describe the back beliefs of a large clinical population with low back pain (LBP), to investigate the associations between back beliefs and patient characteristics when care-seeking, and between on-going pain and back beliefs at follow up.

methodsPatients aged over 18, consulting with LBP with or without radicular pain of all symptom durations, were recruited from chiropractic clinics. The BBQ was completed on the first visit and at 3- and 12-month follow-ups. Sociodemographic- and symptom-related questions were answered at baseline. A BBQ sum score was calculated at all three time points, and linear regression was used to analyse the cross-sectional association between baseline patient characteristics and BBQ scores. Wilcoxon signed-rank test was used to test differences in BBQ scores for patients with and without on-going LBP at 3- and 12-months follow up.

resultsThe baseline population consisted of 2295 participants. The median BBQ sum scores at baseline, 3 and 12 months had interquartile ranges of 33 [29-36], 33 [29-37], and 31 [27-35] respectively. Patient characteristics and symptoms were associated with baseline BBQ scores (p < 0.05), but most association were weak. The strongest association was with severe disability (4.0 points (95% CI 3.3-4.6) lower BBQ than no disability). Negative beliefs were related to more severe LBP at baseline and with on-going pain at follow up.

conclusionAt a population level, back beliefs were generally positive and relatively constant over time, but misconceptions about a poor prognosis were common. Studies exploring individual patterns of back beliefs and associations with clinical outcomes over time are recommended.