Herman PM, Edgington SE, Hurwitz EL, et al. - In view of the observation that for chronic low-back pain (CLBP) and chronic neck pain (CNP), several provider-based nonpharmacologic therapies have now been recommended, researchers here sought to provide one glimpse into the long-term use of nonpharmacologic provider-based care via determining the predictors of visit frequency in a large sample of patients with CLBP and CNP using ongoing chiropractic care. From a large national sample of chiropractic patients in the US with non-specific CLBP and CNP (852 patients with CLBP and 705 with CNP), collection of observationsl data was performed.  Among these patients, they observed average visit frequency of 2.3 chiropractic visits per month—ie, just over one visit every two weeks. Significant variation in this visit frequency was observed by the characteristics of the patients, the characteristics of the treating chiropractors, and the state in which care was given. In the final models, those with CLBP and some coverage for chiropractic showed increased visit frequency (0.44 visits per month), but coverage was observed to have little effect on visits for patients with CNP. Further, more visits were reported for patients with worse function or just starting care and fewer visits were reported for those near to ending care. Patients with higher visit frequency were reported for chiropractors who reported seeing more patients per day, and fewer visits per month were reported for the patients of chiropractors with 20 to 30 years of experience. In addition, the state in which care was received made a difference, likely through state-level policies and regulations, after controlling for both patient and chiropractor characteristics.