Table 1. Patient Demographics.

N: number; SD: standard deviation.

Parameter (N) (%)	Non-obese (N=2,222,836)	Overweight (N=21,222)	Non-morbidly obese (N=298,360)	Morbidly obese (N=133,585)	P-value
Mean age (years) (SD)	66 (12)	64 (11)	63 (11)	61 (10)	<0.001
Sex
Male	197,789 (44.4%)	2,087 (49.0%)	135,178 (45.3%)	52,895 (39.6%)
Female	248,056 (55.6%)	10,812 (50.9%)	163,182 (54.7%)	80,690 (60.4%)	<0.001
Race
White	352,747 (86.6%)	16,940 (85.7%)	227,906 (84.0%)	99,316 (81.5%)
Black	28,467 (7.0%)	1,380 (7.0%)	25,572 (9.4%)	15,017 (12.3%)
Hispanic	13,115 (3.2%)	657 (3.3%)	10,366 (3.8%)	4,392 (3.6%)
Asian	3,868 (0.9%)	168 (0.8%)	1,363 (0.5%)	389 (0.3%)
Native	1,397 (0.3%)	45 (0.2%)	865 (0.3%)	394 (0.3%)
Other race	7,936 (1.9%)	586 (3.0%)	5,209 (1.9%)	2,302 (1.9%)	<0.001
Median household income
Quartile 1	86,580 (19.7%)	3,246 (15.6%)	58,240 (19.8%)	29,873 (22.7%)
Quartile 2	109,116 (24.9%)	4,460 (21.5%)	73,799 (25.1%)	34,739 (26.4%)
Quartile 3	117,062 (26.7%)	4,972 (23.9%)	81,856 (27.9%)	36,188 (27.5%)
Quartile 4	125,723 (28.7%)	8,098 (39.0%)	79,913 (27.2%)	30,682 (23.3%)	<0.001
Primary payer
Medicare	239,883 (53.8%)	9,829 (46.4%)	134,809 (45.3%)	55,352 (41.5%)
Medicaid	17,920 (4.0%)	707 (3.3%)	13,542 (4.5%)	8,550 (6.4%)
Private	172,884 (38.8%)	10,160 (48.0%)	139,269 (46.7%)	64,984 (48.7%)
Self-pay	3,425 (0.8%)	117 (0.6%)	2,027 (0.7%)	958 (0.7%)
No charge	549 (0.1%)	11 (0.1%)	379 (0.1%)	175 (0.1%)
Other pay	11,034 (2.5%)	353 (1.7%)	7,883 (2.6%)	3,348 (2.5%)	<0.001
Charlson Comorbidity Index
0	8,950 (2.0%)	455 (2.1%)	4,868 (1.6%)	2,681 (2.0%)
1	26,702 (6.0%)	1,249 (5.9%)	21,002 (7.0%)	11,114 (8.3%)
2	78,691 (17.6%)	4,632 (21.8%)	60,475 (20.3%)	28,342 (21.2%)
3+	332,076 (74.4%)	14,886 (70.1%)	212,064 (71.1%)	91,481 (68.5%)	<0.001