Study Design. Cross-sectional study. Objective. To investigate the equivalence of electronic and paper version of self-report questionnaires for the assessment of disability, pain, fear of movement, depression, and physical activity of patients with chronic low back pain (LBP). Summary of Background Data. Paper and electronic versions of self-report questionnaires are commonly used for assessment of patients with LBP. However, the equivalence of self-report questionnaires commonly used for assessment of patients with chronic LBP remains unclear. Methods. Seventy-nine individuals with chronic LBP seeking physiotherapy care were recruited. Participants attended the clinic twice with an interval of 1 week and completed the self-reported questionnaires in a random order. The following questionnaires were administered: Roland Morris Disability Questionnaire (RMDQ); 11-point numerical rating scale (NRS); Tampa Scale for Kinesiophobia (TSK); Center for Epidemiological Studies-Depression (CES-D), and Baecke Habitual Physical Activity Questionnaire (BPAQ). To investigate the equivalence between the two questionnaire versions, intraclass correlation coefficient with 95% confidence interval and Bland-Altman plotting was used. Results. The paper and electronic versions of the RMDQ, TSK, and CES-D showed good reliability and the showed moderate reliability. In contrast, the NRS showed poor reliability between the electronic and paper versions. Conclusion. Our findings support that the electronic version of the RMDQ, TSK, CES-D, and BPAQ can be administered in clinical and research settings for assessment of patients with chronic LBP. Nevertheless, electronic version of the NRS for assessment of pain intensity should not be used interchangeably in clinical practice in patients with chronic LBP. Level of Evidence: 3

Background The Sedentary Behavior Questionnaire (SBQ) is a brief and easy instrument to measure time spent on sedentary activities; however, no study has investigated the reliability and validity of this questionnaire in people with chronic low back pain (LBP). Objective To investigate the internal consistency, test‐retest reliability, measurement error, construct validity, and interpretability of the SBQ against data derived from an accelerometer in patients with nonspecific chronic LBP. Study design Cross‐sectional study. Setting Outpatient physiotherapy clinic. Patients Seventy‐five patients aged between 18 and 60 years (mean age, 42 years old) with nonspecific chronic LBP were recruited for this study. Interventions Not applicable. Methods The Cronbach's α was calculated to investigate the internal consistency of the SBQ and the intraclass correlation coefficient (ICC) was calculated to investigate the reliability of the SBQ between two administrations separated by a 1‐week interval. Measurement error was assessed calculating the SEM and minimal detectable change (MDC). Spearman correlation (r) was calculated to investigate the construct validity using hypothesis testing. Interpretability was investigated using ceiling and floor effects. Results The Cronbach's α of the SBQ total score was 0.92, indicating homogeneity among the items of the instrument. The reliability of the SBQ was excellent (ICC > 0.75), without any evidence of ceiling and floor effects. Regarding measurement error, the total score of the SBQ showed an SEM and MDC of 109.8 minutes per day and 304.4 minutes per day, respectively. However, there were no correlations of the SBQ domains or the total score with the accelerometer‐measured sedentary time (r < 0.25). Conclusion The SBQ is a reliable tool for quantifying time spent in sedentary activities of patients with chronic LBP. The SBQ showed poor construct validity compared to the accelerometer‐measured sedentary time, which indicates that patients may underestimate their time spent in sedentary activities.

Background: Physical activity plays an important role in the prognosis of chronic low back pain (LBP); however, whether physical activity predicts pain intensity and disability remains unknown. This study investigated whether objective and subjective physical activity measures predict pain intensity and disability levels 6 months later in patients with chronic LBP. Methods: Patients with chronic LBP seeking care at 2 outpatient physiotherapy clinics were recruited. At baseline assessment, we collected anthropometric/sociodemographic data, duration of symptoms, pain intensity, disability, and physical activity (accelerometer and questionnaire). After 6 months, we reassessed pain and disability. Multivariable regression analyses were performed to investigate the association of physical activity measures with pain and disability at follow-up. Results: A total of 179 patients with chronic LBP were included. High occupational physical activity at baseline predicted disability at 6-month follow-up (B = 1.22; 95% confidence interval, 0.21 to 2.21) after controlling for age and baseline disability, meaning that for every 1-point increase in occupational physical activity, disability increased on average by 1.22 point. The remaining physical activity measures showed no association with pain intensity or disability at follow-up. Conclusion: Higher perceived levels of occupational physical activity predicted higher disability levels at 6-month follow-up in patients with chronic LBP.