<qa>  What is the second phase of the study?This study will compare patients with low back pain LBP to age and gender matched controls to determine if there are differences between the two groups related to: range of movement, secondary outcomes level of disability, quality of life, evidence of depression, anxiety or stress, movement patterns and demographic characteristics. The first phase will include a baseline and 3 month follow-up assessment of the LBP patients and controls, including demographic characteristics, outcome measures, and a physical assessment. The second phase is an ongoing phase with continued interim assessments of LBP patients only, at 6 and 12 months. 