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. 2011 Aug 1;11:609. doi: 10.1186/1471-2458-11-609

Table 1.

Sample characteristics

Total Sample
(N = 398,537)
Adult Sub-sample
(N = 279,241)
Age (mean, SD) 35.3 (23.1) 45.8 (19.4)
Gender, female (N, %) 203,652 (51.0) 145,205 (52.0)
Social Security Waiver (N, %) 49,241 (12.4) 40,947 (14.6)
Charlson Comorbidity Index (mean, SD) 1.19 (2.1) 1.62 (2.3)
Number of ADGs (mean, SD) 4.2 (3.2) 4.7 (3.5)

SD: Standard Deviation

ADG: Aggregate Diagnostic Groups (of possible 32 groups).