↵^a Values are nonstandardized point estimates (95% confidence interval) and associated P value for the effect of the predictor, the main effect of treatment group, and the interaction between predictor and treatment group on function scores. The reference category for the predictor term is a score greater than or equal to the median and for group term is the motor control group. Positive interaction terms for PSFS (function) outcomes and negative interaction terms for pain outcomes indicate a better response to graded activity exercises in participants with lower scores on the predictor variable. LSIQ=Lumbar Spine Instability Questionnaire, CSQ=Coping Strategies Questionnaire, PASS-20=Pain Anxiety Symptom Scale, Örebro questionnaire=Örebro Low Back Pain Screening Questionnaire, IPAQ=International Physical Activity Questionnaire, PSEQ=Pain Self-Efficacy Questionnaire, PSFS=Patient-Specific Functional Scale. Highlighted cells are statistically significant interactions (P<.05).