Only 57 (31.7%) (95% CI, 24.9%-38.5%) of the cases were based on poor-quality or no clinical trial evidence (Category II). Results: Of the 180 cases surveyed, 123 (68.3%) (95% CI, 61.5%-75.1%) were based on clinical trials of good methodologic quality (Category I). To distinguish between good- and poor-quality clinical trials, studies were critically appraised and assigned quality scores. Based on a literature review (Medline, Mantis, and nonautomated searches of local medical libraries), each presenting complaint–primary intervention pairing was categorized according to the level of supporting evidence as follows: Category I, intervention based on good quality clinical trial evidence Category II, intervention based on poor-quality or no clinical trial evidence. Each patient's presenting complaint was paired with the chiropractor's chosen primary intervention. Methods: Data were collected from patient files relating to 180 consecutive patient visits in a suburban chiropractic practice in northern Spain. Objective: To calculate the proportion of care delivered in a chiropractic practice supported by good-quality clinical trials.
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