Fig. 1.

Demographics of identified chronic pain population. The chronic pain cohort was identified within the total Maine All Payer Claims Database for the years 2006, 2007, 2009, and 2010, respectively using the pre-determined ICD-9 codes and opioid prescription criteria (see text for detail). Data from each year were broken down into age, gender, insurance type, and residing county of chronic pain patient, and then analyzed. The chart shows the average of the four years for each of the indicated demographic factors