Table 1.

Summary statistics of study sample.

Characteristic	Total (n = 468,515)		Major Orthopedic Surgery (n = 37,525)		Abdominal-Pelvic Surgery (n = 68,451)		Other Surgery (n = 362,539)
	n	%	n	%	n	%	n	%
Age
<30	3,422	0.7%	96	0.3%	546	0.8%	2,780	0.8%
30 – 39	9,372	2.0%	227	0.6%	2,147	3.1%	6,998	1.9%
40 – 49	32,123	6.9%	1,586	4.2%	6,287	9.2%	24,250	6.7%
50 – 59	120,802	25.8%	9,319	24.8%	17,419	25.4%	94,064	25.9%
60 – 64	98,028	20.9%	8,488	22.6%	13,189	19.3%	76,351	21.1%
65 – 69	57,690	12.3%	4,894	13.0%	7,783	11.4%	45,013	12.4%
70 – 79	96,337	20.6%	8,202	21.9%	13,725	20.1%	74,410	20.5%
80+	50,741	10.8%	4,713	12.6%	7,355	10.7%	38,673	10.7%
Gender
Female	25,139	5.4%	2,020	5.4%	6,962	10.2%	16,157	4.5%
Male	443,376	94.6%	35,505	94.6%	61,489	89.8%	346,382	95.5%
Race/Ethnicity
White non-Hispanic	340,629	72.7%	28,677	76.4%	49,003	71.6%	262,949	72.5%
Black non-Hispanic	77,277	16.5%	4,713	12.6%	11,220	16.4%	61,344	16.9%
Hispanic	24,979	5.3%	1,899	5.1%	4,207	6.1%	18,873	5.2%
Other/Missing	25,630	5.5%	2,236	6.0%	4,021	5.9%	19,373	5.3%
Surgery year
2005	71,362	15.2%	5,350	14.3%	10,220	14.9%	55,792	15.4%
2006	79,690	17.0%	5,982	15.9%	11,708	17.1%	62,000	17.1%
2007	80,355	17.2%	6,030	16.1%	11,736	17.1%	62,589	17.3%
2008	81,102	17.3%	6,787	18.1%	11,741	17.2%	62,574	17.3%
2009	83,010	17.7%	7,043	18.8%	12,059	17.6%	63,908	17.6%
2010	72,996	15.6%	6,333	16.9%	10,987	16.1%	55,676	15.4%