Table 1.

Patient Population Demographics

Demographic	All patients	DMD-treated	Not DMD treated
	N = 11,061	n = 4,462	n = 6,599
Gender
Male	25.8%	23.7%	27.2%
Female	74.2%	76.3%	72.8%
Age (in years, mean ± SD)	50.3 ± 13.3	44.5 ± 10.6	54.3 ± 13.4
18-34	11.5%	18.4%	6.8%
35-44	21.5%	30.4%	15.5%
45-54	31.2%	33.5%	29.7%
55-64	22.5%	15.6%	27.2%
65+	13.2%	2.2%	20.7%
Insurance Type
Commercial	85.1%	96.9%	77.1%
Medicare	14.9%	3.1%	22.9%
Geographic Region
Northeast	12.9%	12.8%	13.0%
North Central	35.6%	32.0%	38.0%
South	30.4%	35.5%	27.0%
West	20.5%	19.2%	21.3%
Unknown	0.6%	0.5%	0.7%
Index year
2001	7.5%	8.0%	7.2%
2002	12.9%	13.0%	12.9%
2003	16.8%	17.7%	16.1%
2004	24.0%	22.1%	25.4%
2005	22.2%	22.5%	21.9%
2006*	16.6%	16.7%	16.5%
Length of follow-up (in months, mean ± SD)	35.7 ± 17.5	36.7 ± 17.6	35.1 ± 17.5

*Patients who indexed on January 1, 2007 are included in 2006 category