Characteristics of chiropractic practitioners, patients, and encounters in Massachusetts and Arizona.

Objective: To describe chiropractic care using data collected at the time of each patient visit.

Methods: Random samples of chiropractors licensed in Arizona and Massachusetts were recruited to participate in interviews about their training, demographics, and practice characteristics. Interviewees were then recruited to record information about patient condition, evaluation, care, and visit disposition on 20 consecutive patient visits.