The study was conducted mainly to examine the convergent validity of the Patient Reported Outcome Measurement Information System-Pediatric Physical Activity instrument (PROMIS^®®®-PA) with step counts from wearable devices and another validated self-reported outcome measure. As a secondary aim, we explored the effect of different recall time frames (7-day, end-of-day [EoD], and ecological momentary assessment [EMA] time frames during the day) in terms of their feasibility and associations with each other and with step counts. This was a prospective cohort study that examined the associations between measures of PA in school-age children and adolescents (n = 84, aged 10–20). The participants wore Fitbit devices for 7 consecutive days, and then completed the 7-day-recall PROMIS-PA short form and Youth Activity Profile (YAP). Additional analyses were completed in a sub-sample (n = 25, aged 11–18 years) using the PROMIS-PA for the EMA at five intervals during the day (shorter form) and at the EoD. In the total sample, the PROMIS-PA results showed positive moderate correlations with the YAP and average daily steps (r = 0.533, p < 0.001 and r = 0.346, p = 0.002, respectively). In the sub-sample, the 7-day PROMIS-PA was highly correlated with the averaged EMA or EoD ratings for the week, and moderately correlated with the daily step counts. These findings support the validity of the PROMIS-PA as a measure of self-reported physical activity. Adolescents demonstrated higher compliance rates and preference for the 7-day recall and EoD assessments compared to more frequent EMA reporting.

To culturally adapt the Arabic version of the Exercise Adherence Rating Scale (EARS) and evaluate its psychometric properties in chronic low back pain patients (CLBP). This methodological study cross-culturally adapted EARS into Arabic (EARS-Ar) following recommended guidelines. Ninety-three CLBP outpatients were prescribed home-based exercises. Dimensionality of the EARS-Ar was assessed by Confirmatory Factor Analysis (CFA) and validity was assessed by comparing EARS-Ar with Fear-Avoidance Beliefs Questionnaire (FABQ), Numeric Pain Rating Scale (NPRS), and Roland Morris Disability Questionnaire (RMDQ). Internal consistency and test-retest reliability were evaluated. Responsiveness was examined using the receiver operating characteristic curve (AUC). CFA confirmed dimensionality of the EARS-Ar. It had moderate negative correlations (rho= -0.42 to -0.62) with FABQ, NPRS, and RMDQ. EARS-Ar demonstrated excellent internal consistency (α = 0.97). Intraclass correlation coefficients were excellent (ICCs= 0.89-0.920) with acceptable corrected item correlations (rho= 0.56-0.77). Responsiveness of the EARs-Ar was good with significant moderate correlation (rho= 0.35) between the EARS-Ar change score and global rating of change (GRoC). A cutoff point of 12.5/24 was determined with moderate accuracy (AUC= 0.81, sensitivity= 81%, specificity= 41%). EARS-Ar showed good reliability, validity, and responsiveness, which renders it a reliable tool for evaluating exercise adherence behavior of CLBP patients.