Table 1.

Demographics of the sampled data set.

Characteristics			Psoriatic arthritis group (n=443)		Control group (n=1772)
Age (years), mean (SD)a			42.66 (17.21)		46.85 (20.18)
Age (years), range (min-max)			5-95		7-94
Sex, n (%)a
	Male	266 (61.43)		989 (57.10)
	Female	177 (38.57)		783 (42.90)
Total diagnosis (ICD-9-CMb), n (%)			520 (47.36)		695 (63.30)
Total medication (ATCc), n (%)			415 (50)		516 (62.17)
Annual accumulation, n
	ICD-9-CM counts per person	32.6		40.1
	Medications per person	50.4		43.9

^aP<.001.

^bICD-9-CM: International Classification of Diseases, Ninth Revision, Clinical Modification.

^cATC: Anatomical Therapeutic Chemical.