Prevalence of study drugs used in the adult Swedish population (≥18 years of age) and corresponding demographics, 15^th August to 15^th December, 2011.

1Standard Deviation 2Defined as a seven-digit Anatomical Therapeutic Chemical (ATC) code. The remaining proportions were prescribed from a specialist care setting. 3Non steroidal anti-inflammatory drugs include all drugs beginning with M01A, glucosamine (M01AX05) excluded.